Timelock

while true do
   shell.run("clear")
   if rs.getInput("right") then
::stilltrue::
    rs.setOutput("left", true)
    os.sleep(0.5)
    rs.setOutput("left", false)
    os.sleep(4)
    if rs.getInput("right") then
        goto stilltrue
    else
    rs.setOutput("left", true)
      print("redstone ON")
   else
      print("redstone OFF")
    rs.setOutput("left", false)
   end
   os.pullEvent("redstone")
end