There are several ways to lock the keyboard on a laptop:

1. On Windows laptops:
   • Press and hold the right Shift key for 8-10 seconds to activate "Filter Keys," which locks the keyboard. A popup will appear to confirm this; click "Yes" to lock it. To unlock, hold the right Shift key again for 8-10 seconds until you hear a beep and the keyboard is unlocked.
   • Use the shortcut Ctrl + Alt + L with the "Keyboard Locker" application to lock the keyboard. Type "unlock" to enable it again.
   • Device Manager: Go to Device Manager, expand "Keyboards," right-click your keyboard device, and select "Disable device" to lock it. To unlock, enable it again.
   • Windows Key + L locks the computer screen and disables keyboard input until login.
2. On Mac laptops:
   • Press Control + Shift + Power button (or Control + Shift + Eject on older models) to lock the screen and disable keyboard input. Unlock by entering the password.
   • Mac does not have a direct keyboard lock shortcut; third-party software may be needed.

These methods primarily apply to Windows 10 and 11 laptops but are common across many models. The easiest and built-in method on Windows is holding the right Shift key for 8 seconds to toggle keyboard lock using Filter Keys.