I always thought pumping gas, and opening doors was a chivalrous thing to do. Although I've gotten yelled at for holding a door for a young woman carrying a box a few years back in college.
I can just imagine it-- you could say, "I'm sorry" and then completely close the front dorm door, leaving her to fumble for her keys, then walk a head of her, and make sure to completely close the next door right in front of her.
It's probably not a good idea, but I can imagine it.
