[kgzak]

No, setting the output of a motor to 0 will not lock the motor in place, it will just not output anything to the motor. The motor controllers have a brake/coast jumper/function that can cause the motor to brake which may or may not be enough to keep the motor from moving. You could also drive the motor at a very slow speed that counteracts the force of the totes. otherwise a simple mechanical brake can be used to hold the motor in place.