def METHOD_NAME(self):
    "implement the door functionality"
    if not self.args:
        self.caller.msg("Usage: open||close <door>")
        return
    door = self.caller.search(self.args)
    if not door:
        return
    if not inherits_from(door, SimpleDoor):
        self.caller.msg("This is not a door.")
        return
    if self.cmdstring == "open":
        if door.locks.check(self.caller, "traverse"):
            self.caller.msg("%s is already open." % door.key)
        else:
            door.setlock("traverse:true()")
            self.caller.msg("You open %s." % door.key)
    else:  # close
        if not door.locks.check(self.caller, "traverse"):
            self.caller.msg("%s is already closed." % door.key)
        else:
            door.setlock("traverse:false()")
            self.caller.msg("You close %s." % door.key)