Hi Jason
Yes, I do have experience with keyless locksets. I even have a few units laying about. A popular unit is "Unican"... I have a brand new one in my basement. The latchbolt is disabled unless the right code is punched in. Pricey @ $300+ in USD. Very nice because they cannot be "wrenched", unlike most locksets. Factory setting is 3-4-5 which is to be changed after install. The 3 is pressed alone.... 4 and 5 are pressed together or at the same time. This may very well be obsolete info.... I have not installed any recent models. This particular brand can be removed and with minor disassembly can be set back to factory settings and reset to the users preference or code.
When dealing with systems with electromagnets or electric strikes things can get rather complicated. Two systems are used... "fail safe" and "fail secure". I have worked with both on commercial applications. I even have a keyless on my garage door...rarely used and I would be hard presssed to find the "over-ride" key or "access" key
