Minecraft 'Computercraft' MOD - Password door

redstone.setOutput("left", true)
correctpassword = "HetIsNiels"
write("What is the password?   ")

password = read()

if password == (correctpassword) then
 write("Password correct!")
 redstone.setOutput("back", true)
 sleep(5)
 os.shutdown()
elseif password == "edit" then
 write("Starting computer modus...")
 write("")
 redstone.setOutput("left", false)
else
 write("Incorrect password! Shuting down the computer...")
 sleep(5)
 os.shutdown()
end