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Ran into the same issue with our 2010CC (not Jetta) as in one of the posts. our problem was both the trunk wouldnt open and the rear fog light wouldnt iluminate. traced wires back to compartment that houses battery. in that space the wiring harness from the trunk lid terimates in multiple conectors. before they do that the wires pop out of the trunk lid support. The support had worn the wires through and 3 of them had been cut through. There are 10 brown wires in gthe bunch of 3 -4 different sizes. Check that area for conection problems.
You may be able to open the vehicle using a coat hanger or similar object to push the lock/unlock button. Once you've gained access to the inside of the vehicle, you can push the trunk unlock button on the dash or floor (can't remember which) and it will release the trunk lock so you can retrieve your keys.
If your lock actuator engages (you can hear the sound it makes) with the remote/electric button on the door, but the trunk doesn't open then the problem is likely a broken plastic arm that the electric assembly pushes. You can see it if you unscrew the inside cover from the trunk lid and try the remote. I started having the same issue with VW Jetta 2002 GLS that was rear-ended 8 months ago. My guess is the cracked plastic finally gave out in the cold weather.