Get active tasks in section

I need to get not completed tasks in section. By default using get tasks from section server send tasks from all time and not sorted
List<Task> beforeTask = client.tasks.getTasksForSection(checkSection).option("pretty", true).execute();
On forum found that in API tester I can use Extra parameters completed_since = now , but how to add it to Java client don’t understand. Tried:
List<Task> beforeTaskSection = client.tasks.findAll().query("section",checkSection).option("completed_since","now").execute();
but it’s not working