At altitude its next to impossible. Quite impossible for a human.
[I apologise for the non-metric units here]
At 35,000 feet the difference in pressure is about 10 psig. The surface area of the hatch is approx 2.5 feet x 4 feet or 10 square feet, or 1440 square inches. As such the force to overcome the pressure differential is 14,400 pounds if applied uniformly. Good luck!
