1
The function to remote lock a laptop on your Microsoft account online is used for a lost or stolen device to protect your data from someone else accessing your personal files, there is no unlock function available, when the device is locked remotely, the only option available to be able to use that device again is to reset Windows, there is no other method available.
2
If you have files on that device that you need to recover, in the Recovery Environment, open Command Prompt.
In Command Prompt type notepad.exe and press Enter.
Notepad should open.
Select File - Open.
You may then be able to use the Open File dialog like a small File Explorer window to drag your files out onto a USB drive.