To me this only makes sense, since the Defiant keyway and keyblank are identical to that of Kwikset also. The one difference between the Defiant cylinder's pins and Kwikset's is that it seems that Defiant cylinders now have ONE spool top pin positioned closest to the keyway opening, followed by four regular top pins, while the lowest grade Kwikset cylinders still have five regular top pins.

• Who Makes Defiant Locksets

They're called keyed-alike locks and are sold in many big name hardware stores. It's something homeowners need to know.

'You might need three locks, but there may be 10 on the shelf, they are all the same key,' said Ron Boddie with B&B Locksmiths.

Boddie says if you purchase locks from a big box store, there's reason for concern.

'Someone could be maybe watching what locks you're buying and find out where you're installing those locks,' Boddie said.

Boddie says someone could purchase a lock with the same key and have access to your home.

'It leaves you vulnerable to someone else, maybe having a key that they shouldn't have,' he said.

It's easy to spot locks that are keyed alike.

'Look right on the box and find a particular key number,' Boddie said.

For example, locks by Schlage with the Number 10239; one key can open four locks. Kwikset is another popular brand that uses the same method with their packaging. One key can actually open six locks.

When we reached out to Home Depot to find out how many of their locks were keyed alike, they said, 'We are not able to break out that information, and to contact the manufacturers.'

If you do buy new locks and want added protection, Boddie has advice before installing them.

'The way to combat it is to have the locks re-keyed,' he said.

To get your locks re-keyed, visit your local locksmith to have them do it for you. Or, just ask the store you're purchasing the locks from to re-key the lock to one you may already own. It's a process that should only take a few minutes.

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If you have a lot of interior doorknobs with key locks on them, sooner or later you're bound to lose the key or lock them inside the room. Here's what to do to get back in.

When one of my interior doors got locked with the keys inside recently, I learned all I ever wanted to know about lock-picking and doorknob assembly. Locksmiths are expensive, so let me share everything I tried and show you how I eventually got the door open.

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If the doorknob in question is a simple push-button affair, most of the time all you need to do is jab a paperclip in the hole and push on the locking mechanism. If the doorknob just has a slit on the outside handle, a butter knife should do the trick.

Keyed locks are a bit trickier to open but it can be done. The easiest approach is to grab a paperclip and tension wrench. If you don't have a tension wrench handy, a very small hex key (roughly the same diameter as the paperclip) will do in a pinch. Take a hammer and flatten the end of the paperclip as flat as you can get it, then grab your makeshift lock-picking tools and head to the door. eHow explains what to do next:

Transformers 4 watch online. Insert the flattened end of the paperclip above the tension wrench. Push it in until you meet resistance. This is the first pin of the lock. Push up on the pin with the paperclip to try and move it out of the way. When it works, the tension wrench will turn a little further. Hold the wrench in this position, still applying pressure so the pin doesn't drop back down.

Take the paperclip out and push it back in again. When you meet the resistance of the next pin, push up on it as well until it moves and the tension wrench turns. Repeat this procedure with the rest of the pins until the lock opens.

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Some lever-type doorknobs respond nicely to the credit card treatment and let you pretend you're a secret agent while you get the door open. wikiHow says just slide the card into the crack in the door, right where the lock is.

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Tilt the card so the side that's closest to you is almost or is touching the doorknob. Push it until you feel it slide in more. Bend the card the opposite way, forcing the lock to go back. Quickly open the door. It is a good idea to lean against the door while doing this, which will help it to pop open.

If you want to go all MacGyver on the locked door, grab a vacuum cleaner, dental floss, and a piece of paper. Use the step-by-step guide over at Instructables to show that locked door who's boss.

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Sometimes, no matter what you do, the lock just won't budge. In that event, it's time to just remove the entire assembly. Slide a butter knife under the collar where the doorknob meets the door and pop the collar loose so you can get at the screws holding the doorknob together. Once the screws are removed, the doorknob will come apart and you'll be able to easily slide back the mechanism holding the door closed.

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If all else fails, there's nothing a hammer wont fix. First, give the doorknob itself several good poundings until it's good and dented. This does absolutely nothing to help unlock the door but it's a great way to get back at the lock that's giving you so much trouble.

Next, insert the claw end of the hammer underneath the top of the doorknob's collar. Put a stiff piece of cardboard where the hammer meets the door to protect the paint. Cover the knob with a thick towel in case metal parts go flying, then yank the hammer down hard. Do this a couple of times until the screws holding the doorknob together snap.

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When you go to the hardware store to buy a new locking doorknob, be sure to have some spare keys made while you're there.

Who Makes Defiant Locksets

How to Open a Locked Door With a Paperclip [eHow]
How to Open a Door With a Credit Card [wikiHow]
How to Open a Locked Door the Macgyver Way [Instructables]