Sorry for any inconviences guys, the game is still in development! I made you guys a tutorial on how you are meant to complete the game!
https://www.youtube.com/watch?v=xDH479GjWDM&t=1s
Btw the last door is meant to open with the key you find in the bathroom but because webgl is bugged sometimes it does not work. Try downloading the game and that will work 100%.