Many newer cars have no trunk keyhole; we open the car, then the trunk.
Electric trunk releases fail when the battery dies; we can still get in.
Registration or ID once it's open.
Sometimes, briefly.
Many, yes.

Lost every car key? Sprint Locksmith cuts and programs new car keys where your car is parked, for many makes and models..

Key fob not working or need a new remote? Sprint Locksmith replaces and programs fobs and smart keys for many cars..

Chip (transponder) car keys cut and programmed so the car starts.