I am reasonably certain I locked the door although of course at the time I didn't pay a "lot" of attention as to whether or not I did it's something I do so automatically so I'm not "absolutely" certain the door is locked but I'm certainly reasonably certain certain enough certainly that I'm not worried the door isn't locked because it's very very unlikely it isn't although of course (for the sake of argument) there is always that possibility the door may in fact be unlocked but even if it is unlocked does that mean someone's going to open it no one ever has before (of course, the door was always locked before).