Keyboards of my Lenovo laptop suddenly stop working?

The keyboards of my Lenovo laptop suddenly stop working?

All?

Are all drivers up to date?

Yes all

From Google

Laptop keyboard does not work - how to solve the problem… Find the "Fn key" on the keyboard and a "keyboard symbol" (often crossed out) on the F1-F12 keys. Press both keys at the same time and then check whether the keyboard works again

Fix locked keyboard for Windows 10
There are just a few steps to unlock the Windows 10 keyboard:

Press the Windows icon and go to the "Settings" item, which is shown as a gear.
Select the menu item "Ease of use".
Select the "Keyboard" tab on the left. Switch off the "stroke delay".
Contrary to the snap-in function, the keystroke delay can result in no more letters being entered. Your keyboard should now work as usual. If this is not the case, you could also try reinstalling the keyboard or simply briefly disconnect the locked Windows 10 keyboard from the PC.

I've already done it, it still doesn't work

I can't go to the settings without entering a password and I can't

Shoot another keyboard into a USB connector on the laptop and then write the password

Didn't understand what you mean. How to plug a keyboard?

If you have another keyboard with a USB cable plug the cable of the 2nd keyboard into the laptop and enter the password.

No, unfortunately not