I had one come in to my 20ac Nursery/Garden Center/Landscape Contracting operation business, back in the late 90s, a big female loaded with babies crawling around on her. Carefully, I used a tongue depressor to left her and the small ones into a Mason Jar, filled with Isopropyl Rubbing alcohol.
It still sits on my office-sunroom desk here in the condo, now that I’m retired after 35yrs in business.
I kill Black Widows with bug spray, although I try to just smash them when I find them in the tortoise habitat. I try to keep that area chemical free, which also helps out the lizards and the hummingbirds.