Thanks for the suggestion Delmarco. I tried that and the trunk remains locked. I can directly lock/unlock the 2 car doors fine with the key.
In the trunk lock, I used to be able to lock/unlock the car doors as well, but they do not respond to my turning the key in the trunk lock any longer.
I understand I might have to get the trunk lock mechanism looked and replaced. Meanwhile, is there any "manual" way to pop the trunk?
By the way, how would a service technician/mechanic get inside the trunk in order to replace the actuator if that is the problem?