“The pressure is on the INSIDE, pushing OUT. It’s not a far stretch to think that the pressure would HELP you open the door, not hinder you”
Perhaps. . .but the doors open inward therefore you are fighting pressurization forcing the door closed, so, in fact, opening a door inflight at altitude would require super human strength.
Even an Olympic class weight lifter couldn't open them. The doors are wedge shaped. The cabin side edgse of are larger than the outside edges of the door. There are literally tens of thousands of pounds of force forcing the door into the door frame.