Embodiments of the present invention provide for methods and systems for accessing a secured building by delivery personnel for delivery of a package including return of a package. The method includes retrieving information from a code associated with a carrier and an address. The code may be a barcode with encoded information. The method further includes confirming that the address is associated with the secured building and further validating the carrier as an authorized carrier by an identification of the carrier. The method further includes validating a status associated with the information to be “in transit” or “out for delivery” for delivery of a package, or “waiting for pick-up” for return of a package. The method may further include checking that an update to the status is within 24 hours. Upon positive response of the status, the method further includes allowing access to the secured building or eventually allowing access to a locker system in the building. Other embodiments may provide for methods and systems for accessing a secured locker system in proximity to a building by delivery personnel for delivery of a package including return of a package. In a nutshell, the embodiments may provide a simpler way for recipients/consumers to return packages to the senders/retailers. Additionally, other embodiments may further provide for methods and systems for performing additional security and management functions by using one or more of a motion detector, a body heat sensor, a camera with a face recognition element and/or a voice recognition element, a display screen, and coordinating them with the building operating system (BOS).