Well no wonder - you should put your purse ON the back seat, not in it
Seriously, this is easily solved and not an issue with the car
Seriously, the phone as a key/key card locking system is the biggest fail of the Model 3. Stop making excuses for it.
Car manufacturers have pretty much perfected the reliability of key fobs for over a decade. Tesla has taken step backwards here. The locking system in a car should be 99.9997% reliable, and with the Model 3 thousands of peoples' experience has shown it not to be.