[WooTFTW]

Do you mean you can do the command only in the pickup? If so use,
https://sampwiki.blast.hk/wiki/IsPlayerInRangeOfPoint

Код:

CMD:pickuphere(playerid, params[])
{
	if(IsPlayerInRangeOfPoint(playerid, 2, 1794.5530,-1899.8702,13.4000)) // Pickup coordinates here
	{
                //The command
        }
        else
        {
              SendClientMessage(playerid, COLOR, "You are not in the pickup");
        }
        return true;
}

A small example