Son Got Summoned for Jury Duty in Houston

My son was summoned for jury duty and we are worried it may hurt him financially. His work won’t pay him any wages for the days he may loose because of jury duty. He is expected to use his PTO, but missing just one day of work (12+ hours) will drain his PTO balance. If he runs out of PTO time (which he does not have much of already), do we just have to accept the fact that he won’t be making money during that time? He graduated college not too long ago, and is stressing because he has to pay rent and his car payments. I really wish I could help him financially but I am already paying his car insurance and can’t help for rent. I figured this would be the best way to help him get advice as I believe jury duty and employer rules differ from California (which is where me and my husband live) and Texas, so I am not of too much help.