People who want to burglar somebody's car or home are generally smart enough to wait until there isn't anybody in them, so I'm not sure what presence has to do with the issue. It's kind of beside the point of the analogy anyway. The point is if you can open a locked door with a valid key, a skilled person can get past the lock with their lockpicking tools, much as hackers can get through DRM. But in both cases, casual unauthorized access is prevented.