Here in the EU, there are several machines that usually can't be opend after only a couple of minutes. And I had this annoyment my self: Had a few items on my arm, walking down the stairs, loading and starting the machine. And on the way back up, I find that 1 sock that fell down without my notice.
However, there is a few basic types of machines about after-start opening.
There are those with the delayed door locks. These take 2 minutes to unlock and usually don't allow opening when wash level is reached. Easy bypassed: Unplugg the machine. Any machine with this kind of interlock I know will recognize this as power outage, thus saveing the cycle status. As no power is supplied to the lock, it will unlock after 2 minutes.
Then, there are the instant door locks. Usually found on higher end models with brushless motors and more exact water level sensors, you press pause, and after a few seconds, the washer will unlock. Or not, if temperature is to high. Not sure if they are bypassable with unplugging, though. Never had to do so, you know.
And there is the door button system. Only encountered it on an AEG and a Miele. The Miele is and was easy bypassed via the emergecy unlock. Just one pull, and the door was opend. The AEGs door button was either lighted green (door openable) or red (door locked), even while a cycle.