In the movies we have seen people opening the door of airplanes during flight but it is not as easy as it seems, It needed super human strength and capable of applying three to four tons of force, then you can open the door. Otherwise, the doors employed in aircraft are plug doors. Such doors only open when there is a significant pressure differential.
At high altitudes, the insides of the plane are pressurized, and the pressure on the hatch door is about three to four tons. They are designed to open only towards the inside, which is the area of high pressure.
When the plane is depressurized, only then is it possible to open this door. But even then, the pressure on the door is about 800 pounds.
The only way the door can open is by an accident where the door gets damaged; it’ll be super noisy, scary and well you’d have a very hard time breathing.
If you are thinking to test your strength and see if you can open that door, which you won’t. even though you won’t open the door but even then authorities will report you to police and well you might get fined like a man in China, and the fine is $30,000.