Take a look.
But, the footage raises a few questions. Why is the torch kept on a very narrow beam? Why does the person filming the incident give us a good view of the corridor EXCEPT on the left-hand side?
As always the key to debunking this one is ignoring the typically low-res versions offered on tabloid news sites and going to the original source on Youtube, where we can examine the footage on full screen and in glorious X0.25 speed.
There we find, during the handy examination of the door by the janitor/guard, our old foe... FISHING WIRE! This time it's been ingeniously attached to the inside of the door.
Yep, nice try, but got ya. Hook, line and sinker.