check in the picture i have already integrated applock but it's required an othet app which is 's secure'.you also can check it's availability in your mobile by go to settings than goto apps section than click on the three dots on upper right corner ...
i think it's not updated for one ui 3.0but it's original app by samsung after installi can access applock from settings. because one ui 2.0 has already stock app lock but it's required othet app to activate.see in the pictures
