[rebuilder]

Try this:

The lobby is not locked. Neither are any of the doors leading out from it. There is a cashier in the lobby and a sign with ticket prices for the different doors.

[Zak]

In that situation, opening the doors without paying is illegal. It would be treated as trespassing or theft of services. You don't have the right to use other peoples' stuff without permission just because it's easy to do.

[rebuilder]

And that was my point.