There are still master and valet keys for your car. If the key will not go in , then that will be most likely. If it goes in , but will not turn, then there is another problem.
The CDL should not work with the battery switched off.
You will need to introduce a 12v feed to the main car feed. Either at the fuse box, alternator , or the thick brown wire cable tied to the back in the mineral oil reservoirs.
Once you have a live feed, you should be able to operate the CDL and open the boot.
Good luck, Paul.