Facing issue with putting a lock for an individual mobile app

Hi, I am not able to put ON the " Norton App Lock Service " and " Norton Security Service " permanently. If I put it ON by going to Norton Mobile Security App and check any other app, lets say " Camera " the mobile asks for the password i have put it earlier. But the moment I close the Camera app and restart, it doesn't ask for the password.

I hope I am able to clarify clearly the issue I am facing.

Please help me on this.