The courts look to the intent not the specifics. You need to see a business lawyer that has experience in Illinois not-for-profits. If YOU open it up and you benefit, you are for profit. If you set up a not-for-profit corp and that corp opens up the store, you have a good chance of being legal and being able to pay yourself a salary for running the corp. Red Cross pays its managers big salaries (so huge they are continually getting bad PR for it) Salvation Army pays its managers. Susan Komen Foundation pays its managers. This is not as simple as you might imagine, so you need a business attorney to keep you out of trouble.
I am not your lawyer and you are not my client. Free advice here is without recourse and any reliance thereupon is at your sole risk. This is done without compensation as a free public service. I am licensed in IL, MO, TX and I am a Reg. Pat. Atty. so advice in any other jurisdiction is strictly general advice and should be confirmed with an attorney licensed in that jurisdiction.
A charity can certainly compensate its executive reasonably for services rendered to the charity. Please see Section 4958 of the Internal Revenue Code re guidance for paying reasonable compensation.