Lua Password script + explanation

-- Variables are being defined here
password = "password" -- This is the password variable
side = "back" -- This is the redstone output side, in this case the back
lockDown = 60 -- If the password is wrong the computer will lock down for 60 seconds
count = 2 -- This number checks how many times you can try entering a password.

-- Clear the screen
os.pullEvent = os.pullEventRaw
term.clear() -- Clear screen
term.setCursorPos(1, 1) --Reset cursor

-- Prints text to the screen
print("Enter the password to open the door.")
var1 = read("*") -- This defines var1 as whatever the user types on the screen. The * means that every character will be replaced with a * to ensure nobody can read the pass while you are typing it.
sleep(0.5)

-- Lockdown check starts here
while true do -- This is a loop and will run continuously.
 if count <= 0 then -- Checks how many tries are left. <= means smaller than or equal to.
  print("Lockdown activated. Program will be inaccessible for: 1 minute(s).")
   for i = 1, 60 do -- Here's another loop. This will repeat the code below 60 times.
    print("Lockdown will disable in: ", lockDown, " seconds.") -- Prints the remaining time
    sleep(1) -- Wait one second
    lockDown = lockDown - 1 -- Subtract one second from the time
    term.clear() -- Clear the screen so it isn't filled with text
    term.setCursorPos(1, 1) -- idem
   end
  lockDown = 60 -- Resets the value
  break -- Loop ends here
 end -- and here

-- Password check starts here
 if var1 ~= password then -- Check if user input DOES NOT match password
  print("Incorrect password.")
  term.clearLine()
  print(count, " attempt(s) remaining.") -- Print remaining attempts
  count = count - 1 -- Subtract 1 from the attempt.
  var1 = read("*") -- Again, accept user input

 elseif var1 == "@quit" then --If you enter a certain code the program will stop.
  break
 elseif var1 == password then -- If user input MATCHES password
  print("Enter the amount of seconds you want the door to stay open. Maximum is 20, minimum is 1.")
  varTime = read() --User input
  varTime = tonumber(varTime) -- Writes user input to value.

  if tonumber(varTime) ~= nil then -- check if user actually inputted something
   if varTime < 1 then -- Smaller than one is not allowed.
    print("Minimum is 1 second.")
    return -- Return to the user input
   elseif varTime > 20 then -- Bigger than 20 seconds isn't allowed either
    print("Maximum is 20 seconds.")
    return -- Back to input again
   elseif varTime >= 1 and varTime <= 20 then -- If input is between 1 and 20, proceed
    print("Door will open. Please leave the console.")
    rs.setOutput(side, true) -- Turns on the output on the side, "back" as defined above.
    sleep(varTime) -- The program waits for the time specified earlier, between 1 and 20 seconds.
    rs.setOutput(side, false) -- Turns redstone off again
    break --Loop
   end -- Ends
  end -- Here
 end -- Password check ends here

sleep(0.5)
end

term.clear() -- Clear the screen
term.setCursorPos(1, 1) -- Reset cursor position

os.reboot() -- Restart the system. In my case I put this program in the startup file so on reboot this program would restart.