human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Player, Position, Starter, Touchdowns, Extra points, Field goals, Points
###Question: What is the lowest number of touchdowns for left halfback WIllie Heston who has more than 15 points?
gpt
SELECT MIN Touchdowns FROM table WHERE Position = left halfback AND Player = willie heston AND Points > 15