Fun problem to solve. Battery is dead and doors are locked. Driver door is stuck shut. How to get in? BMW 2008 335i convertible

My dad recently passed and it's his BMW. It's been sitting because the driver door is stuck shut. I used a unlock kit to pull both handles and the passenger unlocks but doesn't open. Is there a way to use the key on the passenger side? I don't see a lock. Is the battery in the trunk for the whole vehicle or just the convertible motor?