US Patent 10475259 Security system and method of using same

A security system can include a doorbell device comprising a scanner, and a locking mechanism operatively connected to the scanner and a structure, such as a home or lockbox. A key, which can be in the form of a bar code, can be generated and sent to delivery or service personnel needing access to the structure. The delivery or service personnel present the bar code to the scanner. Upon reading the bar code, the locking mechanism is unlocked thereby allowing access to the structure.