user: Question: What is the lowest grid number that had a rider with ktm as the manufacturer who did more than 20 laps?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Hiroshi Aoyama', 'KTM', 20.0, '43:09.316', 1.0]
SQL:

assistant: SELECT MIN("Grid") FROM "Table" WHERE "Manufacturer" = 'ktm' AND "Laps" > 20.0;