The next time you stroll in he'll ask for your cellphone number. For security purposes. If you don't want to provide it now you'll have to tell him that you'll do so another time.
It'll only open if you create an account, log in and agree to every sip you take being recorded and measured.
Sure, it's possible to prise the lid off manually or use a special shutter-blocker, but you often end up with a broken cup. And coffee shop owners call you a thief and find ways to thwart your blocker.