Smile at every person, please and thank you for everything. I hold all the doors.
At work there's fire doors that open both ways, but there's no handle, so you always have to push the door open. It's especially awkward when someone is right outside the door opposite you because you can't pull it open for them, but you can't exactly push it open into them. I always step right back and gesture for them to come through with a big smile on my face, then when I can finally get a grip on the door I stand behind it holding it open for them.
It sounds really dramatic when typed out like that! I think I downplay the whole thing with a kind of shy playfulness.