If you have an old lock in your house, you know how frustrating it is when you put the key in the lock and nothing happens. It won't turn left or right, and you practically break the key off trying to get it back out. (Be careful, because a key broken in the lock is another issue entirely!)
Avoid this frustrating situation with a little help from your kitchen pantry. A thin coating of olive oil will help ease the movement of a key that tends to stick in the lock, making it a lot easier for you to get in and out of the house or room.