So I posted this a while back, never a download, and the version I posted about was buggy, very buggy. If you rapidly smacked the keypad it would mess up the whole structure. This new one is, from what I tested, 100% functional.

Most of you, if not all, will look at the back and think, "Wtf?"
Well the back is essentially the guts of the keypad. The block in green is the number the user pressed on the keypad, it's a counter. The orange number block beside that is a reset counter. The dark blue number blocks is where the password goes. The two red blocks are resets, top is master, the bottom is one used after each press, except the last. The 3 sets of bricks at the bottom are as follows: top is increment password, bottom is decrement, middle three are control and equality check bricks.
Front looks like a standard keypad, top number bricks shows the password you're typing in, green and red lights are flags for a correct or incorrect password, the rest of the white buttons are a standard keypad.
Anything coloured dark black isn't necessary for the circuit to run.
How it works:
Download and find out!
NOTE: File is for Kitchen