Hey, i m looking for auto door lock for like stores, u can lock from inside standing at counter.plz?

Question:i was wondreing that from where i can get that kind of system that i can lock the door automatically by standing at the counter by just pressing a button but the person who is coming in can open it from out side or if want to lock so the door can stay lock.

Answers:
Try this site!

http://www.vonduprin.com/prod_electrical...