I am not a lawyer. This is not legal advice.
However, in my opinion, if you were in charge of a motor vehicle and the officer observed that, and there is no doubt that you were in charge of a motor vehicle (remember this doesn't mean driving, you basically had the keys on you), and the officer requested your driver's license, if you refused, then you broke S.33 of the HTA.
The officer will say that he was just standing in front of the house and saw you get out of a car, and he wanted to make sure you had a valid driver's license. That's it. I don't think he has to say anything more to have a prima facie case under S. 33.
Of course, as stated before, I am not an expert or a lawyer, and this constitutes only my opinion.