The playroom stands for imagination, spontaneity and the child you once were. Finding it dusty or locked is read as play and pleasure that have been pushed out of everyday life.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.