Hi Melanie,
Thank you for contacting us. Sorry to hear that you are having trouble with your Surface Pro Laptop 3.
To unlock the keyboard and pad, please try the following steps:
- Press and hold the Fn key for 10 seconds. This will toggle the Fn lock on or off.
- If that does not work, press and hold the power button for 10 seconds to shut down the device. Then press the power button again to turn it on.
Here's a link to some additional functions including how to lock-unlock your Surface keyboard: Special keys and function keys for Surface type cover and keyboards - Microsoft Support
I hope this resolves your issue. If not, please let me know.
Thanks,
Doug