That will open the door when I am away from player_exit, and I already had that working more or less OK. What I was hoping for is this: you've been out on a dangerous mission, grabbed your special treasure and loot objective and it's time to come home. When you approach home, the door swings open welcomingly just as the screen fades to black and you get the "MISSION COMPLETE" text.
The problem is that an objective that completes the mission does not trigger its Completion Target (or script) and I haven't been able to find a way to fake that behaviour.