Server Room Access

i = 0
rs.setOutput("bottom", false)
function openDoor()
    rs.setOutput("right", true)
    print("Access Granted")
    os.sleep(10)
    rs.setOutput("right", false)
    i = 0
end
function emerEvac()
    rs.setOutput("left", true)
    os.sleep(5)
    rs.setOutput("left", false)
    return("Emergency Evacuation Activated... Please Stand By.")
end
function wrongPass()
    if i == 0 then
        i = 1
        return "2 Attempts Remaining"
    elseif i == 1 then
        i = 2
        return "1 Attempt Remaining"
    elseif i == 2 then
        i = 0
        rs.setOutput("bottom", true)
        return "INVALID AUTHORIZATION, BEGINNING SECTOR LOCKDOWN"
    end
end
while true do
    term.clear()
    term.setCursorPos(1,1)
    rs.setOutput("right", false)
    poweredon = rs.getInput("back")
    if poweredon == true then
        openDoor()
    else
        os.sleep(.5)
    end
    print("Welcome to RFighter15's Server Room!")
        print("Authorized Access Only")
        input = read("-CEN-")
        if input == "serverentry" then
            openDoor()
        elseif input == "emer" then
            print(emerEvac())
        else
            print("Password Incorrect")
            os.sleep(3)
            print(wrongPass())
            os.sleep(5)
        end
end