Just had this happen to me last night. 2019 P3D with like 37k miles. Car was in the driveway as we got things prepared for showings (the house hit the market the next day). Got in my car to pull it back in the garage and everything died. Had to use the emergency door lever to get out. Pushed the door shut and proceeded to troubleshoot. It was/is the 12v battery but I have no way to open the doors, move the car, etc. If I'd had a kid in the back, I'd be breaking a window. Overall a pretty awful design on Tesla's part that the door handles are battery dependent. Even with a 12v charger on it, the door handles wouldn't operate. So, I'd say proactively replace it - because you can't simply "jump start" a Tesla - if it happens when you're on a trip you're in for a lot of inconvenience.