Simple Hot Key Press - AUTOIT

$ON = False

$t = TimerInit()

func toggle()
   $ON = not $ON

   $t = TimerInit()
endfunc

func pressF2()
   if TimerDiff($t) > 20000 then
          ToolTip("Pressing F2...",10,10)

          send("{F2 down}")
          Sleep(100)
          send("{F2 up}")

          $t = TimerInit()
   EndIf
EndFunc

HotKeySet("0", "toggle")

MsgBox(0,"","Press 0 to toggle On/Off")

While True
   Sleep(500)

   if $ON Then
          ToolTip("Script ON: " & Round(TimerDiff($t)/1000,0),10,10)
          pressF2()
   Else
          ToolTip("Script OFF...",10,10)
   endif
WEnd