A little thing, which helped me a few months ago. I rent an apartment and the lock of my apartment is no longer young... And as the owner does not want to change, the key has trouble turning in the barrel.
In short, one night, I could not open the door. Fortunately, my neighbor was there and as this kind of misadventure had already happened to him, he explained that it was enough to rub for a few minutes the key in candle wax. And it's true that it allowed me to open.
Well, it does not prevent the key from getting stuck from time to time but I still have less problems to go home now;)Suggest a tip for this theme