ispressed function not working

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I'm trying to capture the J key

While 1
      If _IsPressed ("4A") Then
         MsgBox ($MB_OK, "", "")
         While _IsPressed("4A")
         Sleep(10)
        WEnd
     EndIf
   WEnd

So it should pull up a msgbox when I press J but it doesn't

Ive also tried without the quotes on 4A that doesn't work either

While 1
      If _IsPressed (4A) Then
         MsgBox ($MB_OK, "", "")
         While _IsPressed(4A)
         Sleep(10)
        WEnd
     EndIf
   WEnd

I tested this with the A key and it works fine

While 1
      If _IsPressed (41) Then
         MsgBox ($MB_OK, "", "")
         While _IsPressed(41)
         Sleep(10)
        WEnd
     EndIf
   WEnd

 

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Disregard this I'm retarded and had another script open that was intercepting the J key