I've seen lots of police video clips of arrestees "kicking" the patrol car door after they've been cuffed and placed into the vehicle.
It's more like "stomping" than "kicking."
Regards,
Maybe that’s how they do it, stomping down, over and over. Following gravity vs actively kicking out at an angle, which takes more energy and coordination. Stomping down follows a natural function of the leg, as in walking forward. A virtual Cake Walk.