My only experience with picketing was at about third-hand. See if you follow this.
In the late 1980s, a new Cub Foods moved into town here. The local chapter of the grocery store workers union (the United Food and Commercial Workers International Union, the UFCW) picketed them, because they were hiring non-union grocery store workers.
So the National Association of Letter Carriers, in a show of some kind of solidarity, joined them on the picket line, and also in organized a city-wide boycott of Cub Foods. I was never able to grasp the exact connection between the two unions, but never mind.
Well, the boycott, needless to say, didn’t work. Day after day, there would be a couple of UFCW people standing out there in front of Cub Foods, with someone from the NALC, carrying signs, while people trampled each other in their haste to get into the store.
This went on for years. At least 10 years. After the first five years or so, they tapered off on the number of people picketing right in front, but there would still be somebody out there by the parking lot exit with a sign, and every so often there would be a big billboard somewhere in town saying, “Shop Union–Boycott Cub Foods”.
So last year, I was talking about this ‘n’ that with the Better Half, and the subject of grocery shopping came up, and he said, “Why don’t you go to Cub Foods for that (whatever it was)?” and I said, “I can’t, because we’re supporting the NALC boycott–aren’t we?”
He was, frankly, astonished. He had forgotten all about it. I said, “Well, is it off?” He said, “Well, actually, no, it’s still on, but I don’t think anybody from the NALC is walking the picket line anymore.”
And he gave me Official Permission to shop at Cub Foods. So I do, sometimes, but I hate having to bag my own groceries while people stand there in line and wait.
The point is, you ask if picketing will do any good. I say, no, because the people brushing past you to get into the building to run their errands quite literally don’t give a rat’s derriere about your “cause”, unless it means money out of their pockets. Failing that, you’re just blocking traffic.
Sorry to be so negative. 