Despite the loked doors the door codes in some airlines are widespread knowledge to many staff (some airlines have retained the same code since the doors were put in). Also on a shorthaul a/c it is possible to position yourself and work out what the code is. Surely a locked door only provides security against the would be one off idiot, those intent on criminal acts will do their research first. Maybe we should consider it lucky that these two were only making a point (allegedly) against the papel visit. This is a timely reminder to all of the flying comunity.