“Shame a good shoulder will just break it.”

True enough, but locks like that (or rather, their simpler brethren) aren’t meant to really keep anyone out. They’re just there to slow down anyone who tries to burst in on you long enough for you to close the door and get it locked properly. Once that’s done, most doors are considerably sturdier than those in the movies. I’m a big guy, and even with a full head of steam charging down the hallway, I still bounced off my sister’s door after she locked herself out.