I have had this happen to me. Not always as you describe, but often. Since I believe in being kind to others and helping as much as possible, I find this an opportunity.
I've seen women struggling to place a huge bag of dogfood in a shopping cart and have volunteered to help. I tend to open doors for ladies and the handicapped. I have been in stores and been dressed in my work clothes (Long sleeved white shirt and dress tie) and been asked for assistance finding something in the store. I didn't tell them I didn't work there, but simply told them where to find it or took them to where I had seen it. Then I tell them I didn't work there.
I've been asked for directions, where a certain food item was, how to tell if a canteloupe is ripe, and numerous other things. I always try to help if I can. If I am on the freeway and see someone is in a hurry, I try and make it where they can pass me, if possible. I've taken time out of my Christmas vacation to use a tow rope to pull a motorist and his family out of a snow bank so they could go on their way. (It was around midnight and I was the only one on the road. Most of the others out were in a ditch.)
I like to play Santa Claus at Christmas and am growing my own beard this year. I have been asked to play Santa Claus for the 6th year in a row.
One of the men I admire most, owned a greeting card company. He was bought out by Halmark or the like. He gave a huge farewell bonus to his employees and made sure they still had a job at the new company. He then put $100 bills in plain white envelopes and handed them out to those in need or having a string of bad luck. He did that for several years befor he died. He lived in or around Kansas City. If I ever become rich I'd do that.
Good luck to you and yours.