

From the menu that appears, click Lock Screen.In the top left corner of your screen, click the Apple icon.

Now, here's how to lock a MacBook keyboard (or any Mac) by locking the screen: To learn more about your Mac features, sign up for our free Tip of the Day Newsletter. How to Lock Mac Keyboard & Screen Manually Whether you want to lock the keyboard on a Mac to clean it, or you have young kids, or a mischievous pet that likes to lay across your keyboard, the easiest way to protect against unwanted changes or entries in text fields is to simply lock your Mac screen. Locking the keyboard but nothing else on your Mac requires a third-party app but in most cases, you don't actually need this.
