A tutorial I’ve found:
http://www.wolfensteinx.com/surface/tutorials/rotating_doors.html
In a german tutorial I’ve read that you have to select the origin brush first then the door brush.
And then make both a “func_door_rotating”.
Here are some maps from the german side:
http://www.haradirki.de/tutor-files/rtcwmaps.zip
“tutor50.map” is the one with the door.
These are for RTCW.