Trying to remember the name of this movie has been driving me crazy for many years. I saw a movie in the early 1970's about someone (I think it was a man) who was stuck in a hotel (or possibly casino). He kept going to the lobby where there were other people. When someone's number was called, they were allowed to leave. This person kept waiting for his number to be called, and it never was. He finds out towards the end, that he's actually dead, and he's "stuck" in that hotel and can't leave.