Techniques for automatically securing receptacles of a retailer via an electronic lock include receiving a user request to reserve a receptacle, selecting a suitable receptacle based on one or more conditions, some of which may be specified by the user, and transmitting an electronic locking signal to secure, and thereby reserve, the selected receptacle. An association between the reserved receptacle and the user is stored, and the user is electronically notified. Subsequently, an electronic signal indicative of the identification of the user (or of the user's agent) is locally received. Upon determination that the user is expected and associated with the reserved receptacle, the techniques include causing an electronic unlocking signal to be transmitted to the electronic lock, thereby unlocking the receptacle. Further subsequently, upon receiving an electronic locking instruction, the receptacle may automatically be secured via its corresponding electronic lock, and a retailer agent may be electronically notified.