Use a really loooonnng extension setup and either remove the two bolts that hold the striker plate to the deck lid, or the three bolts that hold the latch mechanism to the rear panel - all of them face forward so you can get a socket on them.
If you cannot turn the shaft from the inside, then crawl in and remove the clip that holds the lock cylinder in place, a small screw on the side holds the clip in. remove the lock cylinder and then turn the lock with a screwdriver from the outside(or Inside).
Mat has the right idea to open trunk from inside. Carry a flashlight, 5/16 socket wrench, and flatblade screwdriver.
Once the lock cylinder is out, locksmith can 'fix' tumblers to match your existing door key, if you have one. If no door key, he can 'file' one to fit all three, er four cylinders, glove box is same key.
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