They often have them hidden, though.

The other day, a friend of mine had his keys on the table. His car key was the common "oblong box" variety. A small black box, with a couple of buttons.

I asked him if he'd ever had a battery issue, and he said no, but he had nightmares about it.

I then showed him his "hidden" manual key (usually, there's a fingernail slot).

Then, we had to spend some time, looking around his car, for the keyhole.

It turned out to be under the driver's side door handle, covered by a plastic plug.