Can you re-enable areas once used?

[Nevicar]

I took a screenshot of the map to sort of demonstrate it better.

http://i.imgur.com/U4tAW.jpg


Now that you can see it:

Player walks into door, activates the first area (area_4). The key in the desk activates Area_3, when its picked up the door swings open slowly, but once the player comes in contact with Area_3 it slams shut.

So basically, if the player walks into the room and then doesn't open the desk to find the key, they may run back in later and the door won't close, causing the propforce to close the door instead of opening it, making the door slam worthless when they run into area_3.

What area7 does is check the player for the key, if they have it, it does nothing and carries on, but if they DONT have the key then it activates area_6 which then repeats the door close when they re-enter the room.

My brain is telling me I may be over thinking this one.