How to get into the trunk of a 65 Barracuda????

The 65 Barracuda I just purchased has a partial key broken off in the trunk lock. I've tried everything to manipulate it to open without success. Could someone post a picture of the release mechanism inside the trunk that releases the trunk back to fold down. I'm thinking maybe I can access it some way through the rear speaker opening over on the side and lower it. I'm trying not to drill the lock. A picture or any other ideas greatly appreciated. Thanks