Tirez or Poussez

To tirez or to poussez, that is the question. And I am still baffled by it. To put it in context; to enter my office in the department, I have to go through atleast 4 doors - one for the College, one for department, building and then lab. And I am confused at every door - should I pull or should I push. And I try out both and invariably my frist try is the wrong one. So, I discovered that discreetly written near the door was 'tirez' meaning pull, or 'poussez' meaning push. And now, I see before pulling or pushing and my problem is solved.