Banning from the EBT program, civil fines, and, potentially, criminal charges (I’m not sure you can wedge discounts for SNAP beneficiaries into any of the criminal violation categories though it seems like if you did it for cash purchases by SNAP beneficiaries as a way of trying to help deal with the suspension or reduction of SNAP benefits, it could probably be argued to be indirect trafficking—using SNAP payments to subsidize other inventory—which is criminal.)
They don't need a good legal argument to just have border patrol ransack the place and stuff a bunch of customers & employees in detention for a week. We haven't seen (afaik) this sort of vindictive not-even-pretending use of ICE/BP yet but it's right around the corner.