A pretty good way to get in.

I don't get glass front doors, or glass rear doors for that matter. Today, when there is so much crime, I can't imagine why anyone would have a glass door into their home, even if they have an alarm system. All a criminal has to do is smash the glass, reach in, unlock door, and they're in. I read a lot of crime books and all too often that's one of the fastest ways into the house (though I must admit, most of those break ins are staged by a murderous husband of wife). The other popular means of entrance, mostly for strangling young women or kidnapping children, is through an open window. Who the hell leaves an open window to their home at night?  Yes, there's a lot of crime in America: every day new robberies, murders, kidnappings. And, though I hate to say it, much of these crimes are aided and abetted by the victims themselves who are improvident enough to have glass doors into their homes or open windows.