HOLD THE DOOR FOR SOMEONE, THEY DON'T THANK YOU

This is what you should be able to do to them
  1. Send them back, elementary school style
    Say they came from their car. You get to send them back to their car and then they can walk back to the door. Like when you got caught running in the halls.
  2. Smash their faces through the door
  3. Stalk them
    Only for a week, well, a business week. So for 5 days, you're allowed to follow them everywhere. If during that time they don't thank someone for opening a door for them, you are then allowed to repeat everything they say.
  4. Spray paint "I'm an asshole" on their car
  5. Make them carry the door for an entire day
    Everywhere they go. Everything they do. Then everyone who sees them will know that they're an asshole.