The economics of commodities brick and mortar business are very tight.
The reason is because they are... wait for it: commodities.
If the owner is not working the business himself he has to hire someone to do it and along with it goes any chance of making a profit.
If you want to have a side brick and mortar business you have to work on it yourself (and take all the hard work and hours it takes) or accept that you will barely take a dollar out of it.
For such a thing to pay back a decent amount you have to have many of them and that will still probably require a lot of attention just like a full time job, but now as a manager.
I don’t know the reason behind the question but if you are looking for passive income, you should go in the opposite direction.