After watching that video several times, I have found a solution!
Step 1: Driver or front passenger exits car, leaving front door open and walks away from car, probably to the rear
Step 2: Rear passenger opens rear door
Step 3: Rear passenger exits car, standing in the trapezoidal space formed by the doors, the car and the neighboring car or wall, fence or other obstacle
Step 4:
Rear passenger sits down in front seat :shock:
Step 5: Passenger (who was once rear passenger, and now is front passenger) reaches back and closes rear door
Step 6: Passenger (who was once...yada, yada) exits car a second time and either walks to the rear of car or steps back to allow closing of front door and exits to the front of car
Simple six step plan. No problem!