[hec]

Setting the password timer to 0 doesn't lock the device "after less than a minute of usage" if you bump up the "Turn off backlight if device is not used for" timer to a higher number. Just set it to a reasonable timeframe and you'll achieve what you want without need of any extra software (i.e., if you power it off with Power button, it will lock; likewise if you allow it to sit idle for the amount of time you specified, it will turn off the backlight and lock, even without the device being fully off).