After more than three decades working as a flight attendant, Sandy Stein, now 65, finally hit the jackpot.

Stein was 53 when she invented the finders key purse, a tool that hooks onto a handbag and makes it simple to lift out your keys rather than digging for them. That year, she paid cash for a fancy car, hired her first few employees and grossed $4m in sales.

It was a dream scenario in so many ways. But, to Stein’s surprise, all this success led to, loneliness at home. She got divorced — her husband had always been the main breadwinner and grew resentful of Stein’s sudden success, she says. Some of Stein’s friendships were also strained.