Hi Zainab,
Issue reported: We have locked some folders and files on a laptop and now we can’t unlock them.
Observation: It seems that we have a permission issue with specific files and folders.
Troubleshooting: If we right click on the specific folders and files, then click on properties, then on Advanced, then click on Security tab and update the permissions to a full control. We then need to click on Sharing tab under the same window and click on Advanced sharing, we should be able to update permission to a specific folder.
If the issue is somewhat different, please provide more clarity on the stated issue.
You can also reach out to Microsoft Support by following a link mentioned below.
Contact Us - Microsoft Support
Please update with your findings.
Thanks!