Well I do know the picture is bogus. They don't make elevator number pads with the number thirteen in them. It always goes from twelve to fourteen.
As for the "trick" I am doubtful. I always thought there were keys that took control of an elevator but then I am no elevator expert.
i have tried every trick in the book for elevators and none of them have worked :/
I think emergency workers have a special key that allows them to bypass this. Obviously, any simple to use button combination would soon find itself widely dispersed and render most elevator systems unusable due to the actions of a few selfish individuals. Can you imagine if even a few people did this in a skyscraper or something? It would basically shut all transit in the thing down. It would be chaos, a disaster. So thank God that this selfish assholes method doesn't work.