[Thresholdold]

That won't work... the gate has to be 'Open' for the timer to activate, otherwise it might randomly close the gate when someone is trying to open it.

try and use
forward closingtimer();
public closingtimer()
{
if(gateneilsopen == true)
{
MoveObject(gateneils, Coords)
}

or something like that... I'm a noob scripter but I know that code won't work.