The invention relates to a locker comprising compartments; one/more compartment separator(s) which could take a first position, so as to separate the compartments, or a second position, so as to assemble the compartments; doors forming access to the compartments, and electronic locks which can lock or unlock the doors according to the value of an instruction; a control module linked to the electronic locks; means for receiving and authenticating a digital key and for generating an instruction signal; means for determining the positions of the separator(s); when it is determined that the compartment separator(s) is/are positioned in the second position, following the authentication of the digital key, the instruction signal is transmitted to all the electronic locks associated with the doors which form access to the compartments arranged on either side of the compartment separator(s), for the locking or unlocking of said doors.