Have you tried simply rebooting? See if you can use the keys to access the BIOS. If you're feeling adventurous booting from a "live" Linux USB will tell you it's the keyboard or Windows.
Personally I think having a wired USB keyboard stashed in the cupboard along with a wired USB mouse are essential emergency tools for a laptop user.
Last edited by le Pingouin; 23rd Jul 2021 at 13:36.