Not closing doors in movies….

Because it conveys tension, isolation, and closes the scene. Lots of scenes where someone is about to get killed or have something bad happen will have the door being closed.

I think it's one of those real life things that doesnt transfer well to the screen unless it has an explicit use. Same thing with rooms typically being clean or no one actually eating their food at a meal.

Similarly, folks often do not end a phone call verbally. They just hang up.