How do you open the trunk of a 1998 Buick Regal if the keys are locked inside the trunk?

To open the trunk of a 1998 Buick Regal with the keys locked inside, you can try accessing the trunk release lever located inside the car, typically found on the driver's side near the floor or under the dashboard. If that doesn't work, you could also use a slim jim or similar tool to unlock the door and retrieve the keys. Alternatively, you may need to call a locksmith or use a lockout service for assistance.