At restaurants where shoes need to be removed, they have a very neat storing system. They will have a wall of little lockers with a character and/or number on each door. There is a metal pocket on each door that holds a piece of wood. The character on the piece of wood correlates with the one on the door. Somehow the piece of wood, although they are all the same, only unlocks the locker it goes to. When the wood is in the pocket, the door is unlocked. When removed, it is locked. And if you try to place the wood in the wrong locker, it won't insert. I've tried researching this, and I cannot get any answers. It's just magic I suppose.
Wow
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