#1 for me. Office hours are not a suggestion. If you show up 20 minutes before we open just patiently wait until the open sign turns on and we unlock the office. Pounding on the door, ringing the doorbell, circling the building looking for an unlocked door or pressing your face to the windows is just annoying as fuck when the open sign isn't on and the office hours are clearly posted on the door you walked up to.