making a door that crushes enemies and then opens again

[Mk7_Centipede]

I swear I have seen this in doom before, but maybe it was Doom 2?

 

anyhow I am new to the map making with these tools. I searched the forums and web and couldnt find anything specific. I am probably just dumb.

 

anyhow, the question is: how do i make a door that is OPEN, but when you use the action key on it (or a switch) it CLOSES for a few seconds and CRUSHES everything?

 

a reverse airlock, really...

[Kappes Buur]

It looks and acts like a door, but you'll find the

crushing special under crusher.

[Mk7_Centipede]

thank you :)