Legally mandated breaks.

[nycmakeithappen]

I work in a state that requires a 30min unpaid break for every 5+ hour shift. Until recently everyone in my store was accustomed to getting said breaks but lately we have so few hours that it's incredibly impractical. My CSRs are fine but all a little new except one. How am I supposed to do breaks and not have half my store stolen when it's me and one CSR on a Friday night?