Thank you for using just answer.
What seems to be the issue on the car?
Is the rear hatch jammed?
Ok, the rear door is intended to only be opened by the remote (if you have the power door option) or by pulling the handle.
Take a look at the owners manual on page 73 also, there is an override handle that you can access from inside if you pop the cover off at the ventr bottom of the door to "manually" release the door:
If your luggage jammed in the door jamb and is holding this door closed then you will need an assistant to push and pull on the door while you pull this lever to unstick the door.