Shot Clock Question

[David M]

Well I had the ugliest partner I have ever had last night. He was a very good official though (actually the guy is a longtime friend and he is not that ugly).

GV game using 30 second shot clock. Clock is running down. A1 shoots. B1 blocks shot and A1 is unable to release the ball. An instant after I blow my whistle for a held ball the shot clock goes off. I ended up calling a shot clock violation but was wondering if I should have put 1 second back on the clock (offense had arrow)?