Lock your screen by home widget control center tile or long-press home button.

You must enable accessibility service for locking your screen we do NOT collect any user data and we do NOT need internet permission.

How to use:
option 1: add a app widget to your launcher you can choose a transparent widget or a fake Gogole Search Box widget.
option 2: open control center - edit - add Lock tile your your main panel
option 3: click 'rocket' to add a shortcut
option 4: enable long-press home locking and then long press your home button(in your virtual navigation bar)