Lock

pas = "1234"
redstone.setOutput("left", false)
function unlock()
  redstone.setOutput("left", true)
  sleep(2)
  redstone.setOutput("left", false)
end
function pas()
  print('New Password')
  p = read("*")
  pas = p
end
while true do
  term.clear()
  term.setCursorPos(1, 1)
  print 'password:'
  inp = read("*")
  if inp == pas then
    print('say -unlock- or -pas-')
    print('if you say -pas- it will let you change your password')
    op = read()
    if op == unlock then
        unlock()
    end
    if op == pas then
        pas()
    end
  end
end