I work at a movie theater. We have four pairs of front doors, all of which open outwards. One pair has handles; these are the doors which should be used to enter the building. We sell tickets outside, and tear tickets at the door; if both these doors are open, people come in three or four at a time and we can't get to them and take their tickets. So, one of these two doors is always locked, and the entrance door whic…
If you were in front of the door that is open, why say 'Please use this door.' They will. You don't have to say so. People generally do not walk up to the door they do not tend to use. Hence why they assumed that the sign said 'Please use other door', since that is 1) what is most often on the doors and 2) it's illogical to have a confirmatory sign on the open door.