trigger:

class Item24
		{
			position[]={15267.027,18.01264,17250.303};
			a=53;
			b=64;
			angle=-135;
			rectangular=1;
			activationBy="WEST";
			repeating=1;
			interruptable=1;
			age="UNKNOWN";
			text="CommandPost";
			name="CommandPost";
			expCond="(vehicle player) in thislist;";
			expActiv="unitbase = [] execVM ""scripts\base_lock.sqf"";";
			expDesactiv="terminate unitbase; titleText [""You have left the restricted area!""]; player removeaction alarm_on; player removeaction alarm_off;";
			class Effects
			{
				condition="";
			};

base_lock.sqf: (Side info: Status is declared in init.sqf with Status = 1; publicVariable "Status";)

_uid = getPlayerUID player;
if(_uid in PIDArray)
then {
titleText ["Welcome back to the Command Post, Soldier!", "PLAIN DOWN", 3];
alarm_on = player addAction["<t color='#ff0000'>Disable All Kill Zones</t>","scripts\alarm.sqf","",1,false,true,"","Status >= 1"];
alarm_off = player addAction["<t color='#ff0000'>Enable All Kill Zones</t>","scripts\alarm.sqf","",1,false,true,"","Status <= 0"];
}
else
{
if(Status >= 1)
then {
hintC "You are entering a restricted zone, please turn back.";
titleText ["You are entering a restricted zone, please turn back.", 3];
sleep 5;
titleText ["You have 10 seconds to turn back...", "PLAIN DOWN", 3];
sleep 15;
titleText ["You have been warned..!", "PLAIN DOWN", 3];
sleep 5;
player setDamage 1;
};
};

alarm.sqf:

switch (Status) do {
case 1 :
{
Status = 0;
hintC "You have disabled the kill zones in restricted areas!";
player removeaction alarm_on;
};
case 2 :
{
Status = 1;
hintC "You have enabled the kill zones in restricted areas!";
sleep 5;
player removeaction alarm_off;
};
default { hintC "Nothing Special, Please Disperse"
};
};