I'm as prone to error as the next guy, and when you have routines, they often creep into the non-routine moments in your life. Like starting to drive to work on a weekend, or answering the home phone as you answer your work phone. But I just walked around the corner, up to my office door, and pressed the "unlock" button on my car key fob. Yeah. For my office door.
It's a good thing I'm not operating heavy machinery or making critical business decisions that impact a high profile company's customer base.