Sounds like pneumatic system failure which is the first thing I cover in the video. You would need.to take out the left (driver side) license plate light socket, and simply push on the pawl to engage it and allow you to open the trunk. Right now I would guess that your trunk lock handle is floopy (offering no resistance) if you try to open the trunk. As for the drivers door and the gas cap cover their all on the same pneumatic system which you will need to get repaired.

If your not mechanical I recommend you find someone who is and shown them the video.

​​​​​​You'll need to find a mechanic to repair the pneumatics, but if you need immediate access to the trunk this will allow you to get in.