By pure accident I'd read the manual for a similar car. I knew how to lock it without the key by moving the handle. Normally I don't. After 50,000 miles of use, he still didn't know. There was no visual cue.
Instructions are such clumsy things.
Machines can so easily be self-explanatory. A good machine leads the eye accurately. Addison-Wesley Publishing Co., 1992. All Rights Reserved.