Answer
Yes, one could open the door, but it would be difficult.
Work Step by Step
Assume the door has an area of 2 square meters. The force on the door can be calculated as 1 percent of atmospheric pressure, multiplied by the area.
$$F=(0.01)(1.01\times10^5\frac{N}{m^2})(2\;m^2)=2020N$$
This is approximately the weight of 2 large men (about 206 kg each), so one could push open the door, but with difficulty.
