It was quite a while ago for me, but when I was convicted the police told me I had to tell my employers or they would (even though the job I was in the product/service could only be given to adults and the company could only employ adults).
I was lucky nothing ever got promoted but I would have lost my job. I just told the police that I had informed my employers and hoped they would be too lazy to check. Luckily for me they were too lazy to check.