Google got new update and now has added another new feature of Family Link. With the help of this Family Link parent can lock their child device. There is no need to create different account you can lock the device by using the same Google account.
But still the user can use the device after get locked. Google will simply give the alert message to the person who has locked the device, that the device is still in use. Parents can’t change passwords of device they can just lock the device.
How to Lock the Device ?
You have to simply give a voice command to Google Assistant ‘Hey Google, lock <NAME OF USER>device’, it will take little time to detect the voice and will lock the users device.
*Note:Google can recognize up-to 6 voices.
Read more about Family Link :