It
NEVER ceased to amaze me, when I worked in the security business for even large buildings
and enterprises, how even the SIMPLEST 'mechanical' means would 'circumvent' such Code-Pads etc!

Like NOT CLEANING THEM REGULARLY!!! (What?). You walk up to some door access, and see say 4 buttons
that are rubbed 'cleaner' than the rest! Say... 2,4,6,8. So you KNOW the code is either that, or say 4,6,8,2...
or 2,6,8,4 etc etc. 30-secs later, your in!!! Believe me... CLEAN THE KEYPADS!!
