No chance. When the aircraft is fully pressurised the pressure differential is about 8 pounds per square inch. Over the whole door thats about 2 tonnes of force they'd have to move just to pull the door in. Even at lower altitudes the force required would be significant. If the aircraft was fully depressurised then it possible to release the door into the aircraft within its frame, but to actually open the door would require them to push it outwards into a 200 mph airflow and that isn't going to happen. The locking of the doors isn't controlled from the cockpit, thats both unnecessary and undesirable.