1. Create a site and an user.
2. Assign the user into the site.
3. Go to the site / Documents, then add some documents.
4. sign in as the user on another browser, then go to that site / Documents, then lock a document.
5. Fresh the browser of Admin, then click "lock" icon behind the document which has been locked by Community Member.
When you as the Admin click the "lock" icon, you will discover the document can not unlock.