For that added protection and access control a keyless entry may be the way to go for your project.

A plastic card, like a credit card, is your key which is swiped through a card reader at the door for entry.

This system can also be programmed to allow a card to give you access to one or more doors, and not necessarily all doors, to give access control among those who have a card key.

This is a great system for businesses and office spaces where access to certain areas is denied to particular employees.

It can also be used in residential situations as well.