The movie "The Shining" is a psychological horror, in genre. So there should not be any supernatural activity going on in the film.
In one scene towards the climax, Jack was locked in the store room by his wife and the door of the store room was locked from outside. While he was talking with Grady, after their conversation, the door was unlocked and let Jack flee from the store room. The question is who opened the door? There were only three people at the hotel including Jack, his wife and son. Since there is no ghostly activity shown in the movie (except for some hallucinations), what is the most probable description of it?