'Nother Question

Why the hell don't I remember to unlock the door in the mornings here at work? I've only been doing it every single work day for the last three years. But no, I only remember once some poor coworker tries to open the door and almost yanks their arm off 'cause the door is heavy so they really wind up before they pull and then they drop everything when the door doesn't move and it's actually kinda funny and I think I've figured it out, never mind.