Is there a keyboard shortcut to lock the screen on macOS 10.14 Mojave like `Command` + `L` or something easy without setting up Hot Corners/Spaces etc.

The app [Lock Me Now](https://github.com/IGRSoft/LockMeNow) used to work fine till maOS High Sierra, but isn't starting up on macOS Mojave. It is showing this popup as soon as I try to run it:

[![enter image description here](https://i.stack.imgur.com/1nPNX.png)](https://i.stack.imgur.com/1nPNX.png)

Is there an app that works on Mojave which helps to customize the lock keyboard shortcut to Command+L? I am used to using Command+L on windows and older Mac OS (using "Lock me now" app).