Vanilla Hexen Key Question

I have a remote switch that opens a door that I want to only be usable if the player has the fire key. Is there a simple way of doing this in vanilla Hexen using wadauthor. Nothing obvious leaps out at me from the available Linedefs. There only appear to be 4 door lindefs (Close, locked, open and raise) and none of these refer to keys. I know I could achieve what I want using scripting, but is there some inbuilt function for this?

You have to use Door_LockedRaise. (Don't worry, it's an original Hexen type.)

The Fire key has key index 4.

Brilliant, that works perfectly. Thanks for that :)

Oh and my appologies to the mods for posting this in the wrong section (I could have sworn I'd clicked on 'editing' and not 'wads and mods').

No problem, easily fixed.

And wait, you're doing a Hexen map? Awesome :D

Well, kind of. I've been converting one of my smaller doom maps to Hexen. I've really enjoyed doing this, so I may give Null Space the same treatment.