correctable error-did I blow it?

[Matt S.]

Here's the sitch (NFHS rules)-

Coming out of a timeout with 1:33 to play, A1 shoots the front end of a 1 and 1 (should've been 2 shots-it was 10th team foul).

Off of miss, B secures rebound, 10 seconds elapse, and scorers then buzz me to tell me we forgot the second free throw.

We went back, gave A1 his 2nd shot, then gave B the ball where we blew it dead.

So here's the question-do we put the 10 seconds back on the clock? And, should the lane be cleared for the FT, or do we resume play off the FT?