I've been using this same share lock for about a year now and its still going strong. It's just a basic facebook share locker script you can use on blogger or any html template.
I use the script after reverting to classic templates, I think errors would happen if you just try to insert this in to the html editor of your template on blogger. If you don't know how to revert to classic templates heres a image tutorial I made up a while ago.. - http://thirtyminutemarketingmiracle.blogspot.com/
Here's a demo of the working FB to Unlock script - http://exampletheme04.blogspot.com/
The only thing is a popup will occur if a person just try's to close it telling them they must share first but if the person goes to share and then exit's out of the share before sharing, the person can close the locker then..
Warning- This can get your blogger deleted by google but theres still plenty of use for it.
Download Below, I tell how to use the script, its really easy, Trust Me!
Facebook Share script Download