interact with the terminal only once, then when the supervisor starts approaching it, make the janitor chase you. If timed correctly, the supervisor'll make the lasers disappear and also open the exit on the left right after, allowing you to escape the janitor and leave. It's going to become easier next patch, i'm sorry for the trouble.
you can't go through the door because it's a non working door. It does not turn blue when you open it.