Different Level Door Question (scripting)

[genmills]

Hello all!
I have a quick question. I am making an outdoor map that has several buildings, some of which will be locked. I want the doors to lead to new levels, but I want to use regular door models (castle doors, dungeon doors, etc.) instead of the "level" doors.

I know I can add an entity interact function that is triggered when the player clicks on a door, which causes the new level to load, but what do I do about locked doors? Is there a way I can make my function see if the door is unlocked or not before it loads the new level? Let me know if I am being clear enough. Thanks!

p.s. My map is gonna be awesome! I scared myself so badly by accident today... I will try to post screens soon in another thread.