Can you open the door of a front load washer once it has started?

On most front load machines there is a "Pause" option. This drains the water inside the washer and stops the spinning allowing a user to add extra items to the cycle. The user can then press the "play" or "resume" buttons and the cycle will resume where it left off. The doors on front load machines lock, b/c if someone was to open while a cycle was running water would go everywhere.