Only two chords through whole song.
G
Keep a knockin' but you can't come in
Keep a knockin' but you can't come in
D
Keep a knockin' but you can't come in
G
Come back tomorrow and try again
You say you love me but you can't come in
You say you love me but you can't come in
You say you love me but you can't come in
Come back tomorrow and try again
Sax solo
Keep a knockin' but you can't come in
Keep a knockin' but you can't come in
Keep a knockin' but you can't come in
Come back tomorrow and try again
You say you love me but you can't come in
You say you love me but you can't come in
You say you love me but you can't come in
Come back tomorrow and try again
Sax solo
Keep a knockin' but you can't come in
Keep a knockin' but you can't come in
Keep a knockin' but you can't come in
Come back tomorrow and try again
You say you love me but you can't come in
You say you love me but you can't come in
You say you love me but you can't come in
Come back tomorrow and try again
Outro sax solo
Source: https://tabs.ultimate-guitar.com/tab/the_sonics/keep_a_knockin_chords_701291