Locks - S7.E10

The store got a new security system with different kinds of locks with illuminators, cards, and very high tech. But when Jeff, Jodie and Mrs. P. take the box of old locks to the stock room, Sam is trying to figure out how his system works and accidentally locks them in the stockroom for a while. Muffy has another problem; she lost the key to her diary, but finds it in the end.