Automatic crane system
For major production automatic crane systems are preferable. The crane runs itself to the next freezer which is ready and lowers its grab down just above the blocks the freezer has pushed up.
The operator only has to pick the blocks with the crane and put the crane back into automatic mode. Then the crane lifts the blocks, closes the security tray under the blocks, and runs to the palletising table and places the blocks as soon as the table is ready. This frees the operator's resources, so he only has to fill the freezers and grab the blocks.
The crane is controlled by a wireless radio remote control. It's the only tool the operator needs.