If you suddenly encounter Shift key not working issue, you need to check if there is any foreign matter stuck around it. If you don’t clean the keyboard regularly, it could be covered with crumbs, grease and dust, which could stop your keys working properly. You may have snacks and caffeine-powered drinks near your keyboard when you are typing.
You can follow these fixes to solve shift key not working on Windows 10. There is some dust or foreign matter stuck on the keyboard.It becomes a big problem if you find that your Shift key doesn’t work. Shift key is a commonly pressed key which can be used with a combination of other keys such as Alt and Esc to execute certain functions including highlighting text, open Sticky keys and so on. Fix 5: Update or Reinstall the Keyboard Driver.Fix 3: Turn off Sticky/Filter/Toggle keys.