I remember that song! Late 60s? Who did that?
Fats Domino did a version of I Hear You Knockin'. Oddly enough, entertainer Gale Storm (get it?) of "My Little Margie" TV show fame, also recorded I Hear You Knockin' in the 1950's.
The Platters and Dave Edmonds plus a few more.
I think Edmonds is the one "we" remember.