Drive in a car that goes 100mph as a passenger.
As a pasenger => you are NOT in an urgent nervous emergency and in a very stable 1G relaxed condition.
Just "try". => Just try to open the door.
Imagine opening a General Aircraft door in an uncontrolled attitude, in panic and probably under an unknown amount of positive or negative "G".
If the aircraft is not build for "escaping", you are probably not gonna get out.