An assistive robot system includes a lifting mechanism, a movable arm assembly, a processing device, and a non-transitory, processor-readable storage medium in communication with the processing device. The processing device transmits a command to the lifting mechanism to cause the lifting mechanism to move the movable arm assembly such that a container is gripped within the movable arm assembly, transmits a first one or more signals to the movable arm assembly to cause the movable arm assembly to extend in a system longitudinal direction such that the movable arm assembly grips the container. The movable arm assembly is positioned at a release location and transmits a second one or more signals to the movable arm assembly to cause the movable arm assembly to extend in a system lateral direction such that the container gripped within the movable arm assembly is released from the movable arm assembly at the release location.