The Prius doesn’t really have a “key”. The computer will prevent it from being shut off by simply depressing the “on off button” while driving. I think you need to hold it down to convince it to shut off while in motion.
Also, the “shifter” doesn’t really have neutral. Well, it HAS it, but getting to it is a challenge. All of this done with the usual motorist talents / mentality isn’t something I would expect.
As anyone here who rides a motorcycle can tell you, 99.9% of people have NO BUSINESS or even brain function to be on the road.
The wife has a Prius and you are right. It is push button on/off and regulated by the computer. It also doesn’t have the traditional shifter....rather a joystick with Drive Neutral and Reverse which is regulated by the computer. The thing is all computer regulated....if it goes I guess you go with it. It is a lease and I imagine she can offer like $800 to purchase it when the lease is up.