[MenaceX^]

You should first create the gate where you want it, create the object.
Then you can do it with OnPlayerKeyStateChange
like

pawn Код:

if(newkeys==KEY_HANDBRAKE&&IsPlayerInAnyVehicle(playerid)&&GetVehicleModel(GetPlayerVehicleID(playerid))==471) // not sure about the model id
{
  MoveObject(yourobject,newX,newY,newZ);
  SendClientMessage(playerid,color,"You used the horn and opened the gate.");
}