Five minutes later, you’d be able to buy that pack of cigarettes legally.
For example, if you lived in the UK and went to your local Tesco and tried to buy a pack of cigarettes when you were 17, 5 minutes before you turned 18, you would be breaking the law. There’s a plethora of rules, restrictions, and arbitrary decisions made in our lives on our behalf, and these are often in the form of laws.