As suggested in some other answers the best way to get it open is as follows.
How to fix door handle on nissan pathfinder.
Fix r51 pathfinder rear door handle exterior duration.
Thank you for watching my channel.
I show the process of replacing an interior door handle that was broken on my 2013 nissan altima.
You may need to repeat this.
The hinge inside the exterior door latch rusts over time and sticks.
All the videos i upload is to assist any individual with some thing they might of not know until watching one of these vid.
Very easy job link where i bought the handle.
Pull the latch open and spray wd 40 into the handle openings using the spray tube that came with the wd 40.