A code breaker would really be at least 5-bits so no one would guess it. The purpose is so only the owner would know it. Make the code, guess the code, activate it, last hopefully it's a yes. Check below.
UPPER LEFT 1/0--------CODE INPUT(1-BIT)
LOWER RIGHT 1/0-----CODE PROGRAM
LOWER BUTTON-------ACTIVATE
"YES"------------------------RIGHT/UNLOCKED
"NO"-------------------------WRONG/LOCKED
BLUE LED-----------------CODE PROGRAM ON
