try some of these
-Lock again and unlock
-push the lid down and then try to unlock
-if all that does not help, best way is to remove the center console in the rear, behind that is the perforated plate for the skibag, use a rubber hammer and hit it with some heavy blows, it goes out easy.
Then prepare a long stick with a hook, pull the carpet panel away at the rear of the trunk (the one which is at the end and where the car jack is located). Then you see with a flashlight the locking system. There is something which look like this
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proceed as Gale shows it there