Most modern automated systems began to pressurize when weight is off the wheels. The outflow valves, most commonly on the rear of the cabin bulkhead, will fluctuate from open to closed to provide a cabin pressure between 6 and 8.6 psi, depending on the altitude. Above 8.7-8.9 psi, the pressurization system goes through several safety modes to maintain the pressure below a point of bulkhead failure. Each manufacture of commercial aircraft has slight differences with the same operating concept.
Aircraft doors and E-windows that are of the plug type would be extremely, if not impossible, to open at these internal pressures. Exceptions to the plug doors would be the rear air stairs on some aircraft.
Examples; some B727 and DC9/MD80s. However, these airstairs had a latching system that would not open with a pressurized cabin. Example: DB Cooper ordered the crew to descend to 10,000 ft and depressurize the aircraft so the air stairs could be opened.
Some of the newer aircraft have internal mechanical pins in the window frames that are latched when the aircraft engines are operating above normal ground power settings. Im not real familiar with this system as I retired before this system was used.