This is something to consider - demonstrating the consequences of "not finishing homework" ...
Remember the "Midus touch":
Midas was a legendary king of Phrygia (in modern-day Turkey). In return for a good deed, he was granted one wish by the god Dionysus, and asked for the power to turn everything he touched into gold. ... When "Midas touch" is used today, the moral of this tale of greed is usually ignored.
Midas Touch | Definition of Midas Touch by Merriam-Webster
https://www.merriam-webster.com/dictionary/Midas%20touch
Turn this around:
Whenever the boy does not do what he is supposed to do, such as finishing his homework, then, make him the exact opposite of Midus - turn everything he touches to "be locked up" or put away - turn on the TV? - no tv that day; play video games? no video games for the day or more; ...