There was an American movie where the man in the gunfight came home, took out a little mouse, went in through the path on the door, and opened the door through the little mouse.

Hello, I'm a fan of online literature. According to the information you provided, I can help you answer this question. There was an American movie called The Rundown, which told the story of a man named Jack Gyllenhaal who used a mouse to unlock the door when he returned home. The scene in the movie did not actually happen. It was created by the screenwriter and director to create an atmosphere. I hope my answer can help you!