Well, I drove to a company parking lot and I thought I had hit the Power button to shut off, but it seems that I had not actually shut off the engine.
All this time the key was in my pocket and I was about 5 miles away from the car.
I came back from lunch after 30 minutes and the car was still running.

I did not hear any beeps that it normally does when I exit the car without the engine shut-off, and I move away.
I have gotten used to the car auto locking after 60 seconds, so when I exit after I hit the shut-off button, I do not bother to lock the car with the remote, unless I am in a public (other than my home or office parking lot) place.

Any thoughts?

 

There should have been two different warning beeps, the first when you opened the door (similar to leaving the keys in the ignition) and the second when you closed the door and started walking away. I'm not aware of any auto locking feature after 60 seconds. In fact it won't lock if the engine is still running. Best thing to do is make sure you lock it before you go. Chalk it up to a lesson learned.

 

haha, i did the same thing when i first got my car, i just completely forgot to turn it off. i heard the beeps but didnt know what it meant, till this lady came in the barber shop and said somebody left there lexus running lol.

 

I have heard the beeps/warning a lot of times as I walk around the car to put the kids in the back seat and I was able to hear the longer beep signal when I moved more than 5 feet away from the car. but this time I did not hear any beeps.

The "Auto Lock" option is available, search in the menu for vehicle customization. You can actually setup the time it takes to lock the car once you move away from it.