Just place a trigger_multiple somewhere, where the marines or aliens will trigger it, then go to properties. Go to "delay before fire" parameter (considering that you are in smart mode) and select the delay amount, you wish. Or, create a brush that represents a button, tie it to a func_button and set the delay before fire. Voila. (I hope you know the other basic stuff that I didn't describe here...) <!--emo&:)--><img src='http://www.unknownworlds.com/forums/html/emoticons/smile.gif' border='0' style='vertical-align:middle' alt='smile.gif'><!--endemo-->
If you want to make the door open a certain time after the map starts you can use trigger_auto, and you can set the time to something like 300 seconds (5 minutes).
You can just use that trigger_random entity and set the time to 0 <!--emo&:D--><img src='http://www.unknownworlds.com/forums/html/emoticons/biggrin.gif' border='0' style='vertical-align:middle' alt='biggrin.gif'><!--endemo-->
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