ARMA DATABASE

Place barrier on editor (we will take the Land_BarGate_F  for exemple) and name it bar

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Make a trigger around this barrier and place theses conditions inside :

Activation : BLUFOR (or other)
Repeat : yes
Server only : yes (its better to place yes)

 

On activation, past : bar animateSource ["Door_1_source", 1, false];
On deactivation, past : bar animateSource ["Door_1_source", 0, false];

 

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When you place you will go inside your trigger, barrier will open and will close when you will go out of this trigger