Interesting, buddy..It's basically the beginning of Johnny B Goode
The sturctures of both Keep a Knockin and Johnny B. Goode are very similar. I just read the Wiki where Jimmy Paige mentions Bonzo played the beginning of the Little Richard tune. When I play Rock N Roll live, I sing the beginning guitar riff of Johnny B. Goode to myself. It matches perfectly.I think you mean Little Richard's version of " Keep a Knocking"