Well here it is. I was messing around with events and the idea came to me to make one of these. It took me about 20min. to make on my server and it is built all on a 2x4F brick.
It has 99 different combos and it only uses 4 different kinds of bricks. 1x1, 1x1 print, 1x1F, 1x2F. The lock can also work with any door you make. The only problem is that you need to change the door so that it if a relay hits it, it openes instead of OnActivate.
Here is a picture of the front of it and a door:

This is a picture of the side to show the slim profile of it:

Feel free to comment and rate x/10