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.
This week we've been discussing emotions and feelings. To help the children understand their emotions, I painted 'feelings stones' and set up this lovely table, where the children can recreate their own faces - or any silly face they like!