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There are two kinds of glues: ones that work by drying out, and ones that work through some sort of chemical reaction that makes them hard. Superglue is a chemical-reaction glue, as are epoxies and polyurethanes. Elmer's Glue-All is a drying-out kind of glue.
If you were to put a little bit of superglue in the lock, like say a drop or two, it would just go to the bottom of the lock and cure. The pins are in the top of the lock, so you're not going to hurt anything UNLESS the keyholder comes home before the glue cures. When she sticks her key in and unlocks the door, she'll be unable to get the key back out and she'll freak. This is always fun.
Now, if you put a whole tube of superglue in the lock, when the keyholder comes home he'll stick his key in the deadbolt and open it. Superglue needs to be in a thin layer, and pumping a lot of it into the lock will give you a thick layer. The fun part comes when he unlocks the knob: there's now a thin layer of superglue on the key, which will glue it into the doorknob. Naturally, he'll freak then too.
Now let's say someone did this to you. Once you've gotten into the house, remove the locks from your door with a screwdriver. All you need for this is the part you stick the key in. Now, call your local Home Depot (if it's a Schlage or a Kwikset) or Lowe's (if it's a Yale--I think they have Kwiksets too) and explain to them you'll need some help. You COULD do this by yourself--it's pretty easy--but you need a lock rekeying kit that isn't easy to come by. Get your locks and two peanut butter jars and go to the store at 5 pm--this is dinnertime, so most home centers are quiet then. Stop off at a supermarket for some pipe cleaners. At the home center, start by purchasing a gallon of acetone, a gallon bucket with a lid and some chemical resistant gloves. Go outside. Put one lock in each jar and cover it with acetone, then swish it around for a little while. Try turning the key on each lock. When it's turning freely, take the lock to the hardware guy and have him disassemble it, which will require about two minutes of his time. You need the cylinder out of the lock, the pins out of the cylinder and the pins, springs and cap off the body. Take them back outside and wash them in clean acetone two times. (The bucket is to hold the used acetone.) Use the pipe cleaners to scrub it out good. Then have the guy reassemble the lock, which takes maybe five minutes--and ask him to put a little graphite on it so it will work well. Ask to have your acetone put in the hazmat locker. (It costs me $10,000 to get the hazmat guy to walk through the door. He could haul off one bucket with an oily rag in the bottom, or the entire contents of the fertilizer aisle, and it would still be ten grand. Yeah, we'll take your acetone.) And finally, if you went to Home Depot be sure to find a manager and tell him what a wonderful job the hardware guy did on your locks; the hardware guy will get a merit badge (if we turn in five badges $100 will appear in our next paycheck) and he will be happy. I don't know what Lowe's does but tell the manager anyway.
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