You will have to be Hercules yourself to try and open the door in the first place , and even then it would be impossible!!
Let us assume for a minute the prssurization system can blow the cabin up to 8 PSI (pounds per square inch)and the size of the door is 1,2 m x 1 m) - I am only guessing here about the size of the door, but purely for demonstration purposes. The are of the door in inches is roughly (1,2 x 3,2ft x 12 inches x 1 m x 3,2 x 12 inches) this is (47,244 x 39,37 = 1860 square inches. The cabin prssure we said is equal to 8 pounds per square inch and the door area is 1860 sqaure inches. So the weight of the door is 1860 x 8 = 14 880 pounds This shows that you have to be stronger than Rambo to unplug that door !
Hope this helps!
Chers
Fart