a good old fashioned crow bar
Take the back seat out and crawl to the trunk key tumbler with a screwdriver.
double click on the icon
Short of shattering a window, might need to call a locksmith
Just keep clicking the unlock button and if that doesn't work, Call your local breakdown service eg: AA Or go to a near by Garrage they should be able to sort it out. But again, if you can't do any...
My subaru keys are locked inside. Is there anyway of getting into the car?