The solenoid is likely spring return so it is normally out. When power is applied to unlock the door the solenoid should pull in. A defective solenoid may not pull in far enough or with enough force (or not at all), which may prevent the door from unlocking (hence a defective solenoid).

It is common to use a spring return solenoid in this way instead of a constantly-powered solenoid as you don't want the door to unlock if the car battery dies (or is disconnected by car thieves).

How do I get the door panel off w/o breaking it?

Carefully as it is likely held together by a few screws and a lot of plastic press-fit connections. Someone here may know where you can download a handbook for the vehicle to assist.

Are you sure the mechanism is a solenoid?

I replaced a door lock mechanism in a similar vehicle from 1998 and it was a geared servo-motor actuator. Door would unlock electronically, but servo could not lock door.

Plastic gears inside servo were damaged. I could have repaired servo, but only complete new mechanisms were available (no parts). Replacement was my best option.

Door panels are held on by special snap fasteners (and screws). If you know where they are located, a special tool (or a slim screwdriver) can be used to safely remove panel. WARNING: It is very easy to damage or break the door panel the first time you attempt removal. Referencing a repair manual specific to your model is usually very helpful.

Good Luck!