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A hypothetical question - if I get a key in the door lock from one side of the door, could I somehow use another key to open the door from the other side?

And what if you could "engineer" the stuck key - is it possible to allow the other key to open the door?

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What do you mean "'engineer' the stuck key"? –  Jay Bazuzi Jul 8 '11 at 5:46
    
you can lock the lock if one key is completely turned clock wise until it cant turn any more-- especially desigfned for situation to prevent people with other keys to unloick the door from the other side if you dont want them toop - eg 1 door office.. –  ppumkin Jul 8 '11 at 13:40
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Hypothetical questions usually don't work well in StackExchange. Do you have a real problem you're trying to solve? (What is it?) –  Jay Bazuzi Jul 8 '11 at 14:57

4 Answers 4

Before the key gets stuck, use graphite to lubricate the lock.

When the key gets stuck, there's nothing preventing you from using the other side of a lock (it's not the same keyhole).

If you can't gently unstick the key (forcefully removing a key may bend the pins in the lock, rendering it useless), then it's probably easiest to replace the entire lock. They aren't too expensive, and installing them where the same size lock already exists is a simple matter of unscrewing the old and screwing in the new.

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Thanks for ideas - but it should be some permanent solution. i.e - not replacing the lock :) –  Bob Jul 7 '11 at 18:29
    
So that I could use the "trick" every time the key is stuck on the other side. As I've said - I can "engineer" the side that is stuck before it is stuck - thus somehow enabling to open the door with another key, while that one is stuck inside –  Bob Jul 7 '11 at 18:30
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@Bob, I think the question becomes, "why is the key getting stuck?" and also, why won't graphite help? Sometimes the best solutions to an engineering problem is to not have the problem in the first place. –  BMitch Jul 7 '11 at 21:38
    
the key is getting "stuck" on purpose :) now the problem is to open the door anyway. Graphite is problematic here because if the key has already been turned - it won't help (the lock will hold the key inside) –  Bob Jul 8 '11 at 9:10
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Forgive me for being blunt, but perhaps you should ask your actual question, because your current one makes no sense. You want to remove a stuck key that is turned in a lock, but you don't want to unturn it? This is a site for home improvement, not mind reading. –  BMitch Jul 8 '11 at 11:43

This might not be the answer you are looking for but try to remove the lock from the door and take it to a locksmith. They can easily get the broken key out, with no damage to the lock. The price should not be very expensive, a lot cheaper than replacing with a good lock and if you need some keys remade, well you went to the right place.

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If the key is all the way in the keyhole so that the pins are lined up, you can just use a screwdriver to turn the bolt.

You'd need a key extraction tool to remove it.

Key extraction tool

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Assuming that I understand your question -- which as others have said is not well phrased -- Assuming this is a modern lockset rather than bit keys, a stuck key only blocks the cylinder it is stuck in. If there is a cylinder or thumbturn on the other side of the door, it would continue to operate the lock normally.

If that doesn't answer your question, please clarify.

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