I'm going to cross post this in several groups...so I aplogize in advance but it does cover several areas.

I am searching for a source that can provide a door lock solenoid, but its a little different (maybe?) than the normal one.

I need the ability to use a key to unlock it normally, but on a case by case basis, be able to have the plunger be activated electrically.  In other words, normally you would unlock it using a key, but maybe once a month be able to operate the solenoid from a 12VDC driver circuit.  I don't want the electronics, thats the part I am doing, just the deadbolt, key and solenoid.

I require of courser, a low cost solution, and this is for a potentially high volume application.

And yes, of course, I have and will continue to google for it but havent found anything that is satisfactory.