I think it was a kids film. This boy and girl become friends and there’s something about them playing the piano. Now I might have this wrong but I think the girl was a ghost (or the boy) and the boy is angry at the girl about hiding she was a ghost and he ends up shutting himself in the cupboard. The doorknob falls off however and he is trapped. For some reason I can’t remember the house ends up on fire. The ghost is then scared for him and is trying to pick up the door handle so she can put it back on the door and the boy can escape. It’s luckily a happy ending as she does manage to get the door knob back on the door.