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Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
If the lock cylinder is not turning properly with the metal key blade try spraying some lubricant into the cylinder and try working the key in the cylinder as this sometimes free's it up.If this is o.k. and the cylinder is turning properly then most likely the latch is jammed or the linkage has become disconnected or broken.
Unfortunately on this model the interior back paneling behind the drivers seat area will not allow access into the trunk.What we have had to do unfortunately is either have a lock smith come out with their tools to try and unlock the trunk and open it or the lock cylinder itself had to be drilled out to then use a long rod to open the latch then the lock cylinder and any component in the latch area damaged replaced.I have had to do this a few times and have seen lock smiths have to do this as well unfortunately.
Here is a diagram of the lock and latch layout.I apologize as this was the best picture I can locate on this.
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Just to be sure have you tried the metal key blade to open the boot?
Let me know,thanks Pete