Door Example #1

Here is an example map on how to make rotating doors in counter-strike source, with rotating handles.

[HIGH-RES SCREENSHOTS]

The first door has the animation built in, so all you do is place the prop_rotating_door and choose this model, and the functional rotating handle will show up in the game.(sometimes the animation sticks, but this is a problem inherent in the game)

The second example uses a brushwork door with a func_rotating nodraw brush parented to it, then two model door handles(front and back) parented to it. (for the models i used prop_dynamic, but prop_static might work as well and would be preferable)

Note
I set the door rotations to 70 degrees to make a better screenshot, but you can change it to whatever you want(usually 90°).

Disclamer
Keep in mind i'm still a noob in source mapping, and i'm sure there are better/simpler ways to do this, but it does give you a simple preview of Source's input/output system(the second door).