Could also connect a bunch of locks and put all the keys on a key ring. Lots of pictures of latch, lock, etc ideas for montessori type preschool. This lock one could be made with 2 boards, some o-rings, and some locks from Dollar Store.
displaying toys for a toddler Great article on organizing and minimizing toy clutter. Need to look more into the idea of Montessori though, since I don't know much of the philosophy, or whether or not I agree with it.