Need door lock program but have no idea how to make!

Hello, I just installed this mod today and well I'm completely lost… All I want is a lock for my subway that prevents those without a keycard to enter. Basically I was wondering if anyone had any scripts I could use as a type of "access card" for the subway, along with the actual lock for the door. Also, I would need help on how to enter the script to make it work…

Thanks!!

This is not a request forum; if you head over to the Program Library, there are a few lock programs, you just have to search for them :o/>/>