Normal field goal block play,
Adjust d-line to "contain QB"
Control the guy who would be the returner,
Line him up just behind the line and slightly to the outside
Time the snap and the line will open up a hole for you to be able to get your guy through.
Here's a video of one of my blocks. It's obviously easier with agile guys wth high acceleration. I may get one block in a year.
http://youtu.be/_dk-y5oreMY