I understand that rush hour is a busy and hectic time for your staff. However, if your conductors are going to instruct passengers to use all available doors and then immediately thereafter shut the doors promptly before one can get to the next nearest available door, maybe the conductors should consider leaving the closing doors open a few seconds longer so that passengers can use the other available doors.
P.S. And please stop telling me that there is another train directly behind this one ... when there isn't.
P.P.S. And about that other thing ...