High school shot clock?

[ODog]

No, an official will not do this. Just a trained shot-clock operator, as in a college game.

In Massachusetts, we have had a 30-second shot clock for all high school and many intercity 5th-8th grade games for more than a decade.

Typically, you have a scorer, a timer and a shot clock operator at the table. Sometimes, an experienced and highly capable person handles both timer and shot clock duties.