You know, “hatch”. But it’s funnier saying door. Could a ship just dock with it, equalise pressure, and open the hatch? Or is there some sort of security? I tend to think ‘no’ because of a macabre situation where the crew are dead and the station is being recovered. But it’s amusing to think in space they don’t need to keep the doors locked.
Is it physically impossible or physically impossible for a human? Obviously something can punch a hole through it, but is the material not strong enough to sustain the force needed for it and to hold together?
Physically impossible to open the door in a fashion it was meant to be. Airplane doors are designed to open inwards. The air pressure inside the plane pushed the door into place evenly over the entire surface. Given an approximate pressure differential of 8psi spread across a minimum 24x48" airplane for would be 10,752 pounds of force that would need to be overcome to open the door. There is no way to apply that kind of force from inside the plane that wouldn’t catastrophically damage the door prior to opening. You can’t just pull the handle that hard without it breaking. There’d be nothing to grab that would pull out in without failure.
So maybe you could rig up a machine to break a portion of the door and create a hole. But the door would in no way be intact or functional afterwards.
For a human. By having doors open towards the side with the higher pressure it makes actually moving the door exceptionally difficult even if the handle is actuated to allow it to open. I’m also pretty sure that most airplanes have mechanical latches that prevent the handle from moving to the open position as well.
However, everything is possible with enough and properly applied forces. You may not end up with the door in the same shape you started with though.