GSX doesn't have an auto-close door option, on any aircraft.
Even if some users asked for this, we never added it, because we know we would surely run into problems if we tried to touch any airplane system, for example by messing up with some possible internal simulation of electrical systems connecting to the door, possible simulated failures, etc.
That's why GSX doesn't open/close any doors, on any airplane: it's something that's best left to the airplane developers, because they know better what is safe and what it's not safe to do on their plane.