i kind of hate this because the keys are not incorporeal. So while the ghost can go through the door with ease the keys can't even if the ghost could interact with the keys in the first place. 😜
Thanks a lot for your idea! I'm thinking of drawing a version where the 'smart' ghost suggests go through the door and get the key. The key dropped on the floor inside, and the two sitting on the floor outside again, frowned and not knowing what to do.