This is for your house?
What do you need and what do you want?
Ordinary houses use ordinary mechanical key locks which are very economical, easy to install and have a fair level of security when installed correctly. The downside is that if you loose a key you may have to re-key all locks and issue new keys to everybody. That gets to be more expensive that the lock itself.
For commercial users where a large number of people are going to use a building for a short time, some kind of disposable or reusable key is desirable. Also, other institutions may need reusable keys or a lock with a code entry. Like a jail or a warehouse or any place where there is a need to have a lot of keys that have to be renewed often. For example, the county fairground might switch over to a form of electronic lock to allow frequent changes in of a large number of keys.
RFID is becoming the choice for its flexibility. The key can be either a card or a key chain dongle, or both. The door lock is privy, but the keys are very cheap and can be programed by an trustee who has no technical background.
Expect to pay $100 and up for each RFID door lock. Amazon has a selection.
