Actually, the computer is not locked - it just appears to be. In fact, if you have more than one monitor attached, it is easy to remove the scam page and not lose anything.
It isn't important, but my friend accessed one of these scam pages by making a single letter typo when trying to access a page. I am not providing details because I don't want anyone else to be affected. And - YES - we did report the scam page to several groups that should help take it down.
This page exists because all the help pages I found worked .. but then you lost all the open tabs.
The procedure detailed below worked for me without losing any of the open tabs :)
How I removed one of these
As mentioned above, there must be at least 2 instances of Chrome running. You can use Alt-Tab to switch between open windows (instances). For the following to work, you must first switch to a Chrome window that is not locked by the scam page. If you have multiple monitors, you might be able to do this with the mouse, otherwise, you need to use Alt-tab.
In Chrome, there are 3 dots in the upper right.
On the system I was using, it was obvious which page was the scam - it had a big warning on it. Use Ctrl-W to close just that tab. (The 'X' on the tab should also work)
I performed these steps on a friends machine and might have left out a minor point or two. (Hope not) Good luck.