PPTO/51

Can we be coached for using PPTO? At my store even if you give them advance notice they still have a conversation with us about using it and said they will talk to us about our “lost productivity”. They’ve also been cracking down on people who leave at 51 because the 51 rule should only be used if we have an emergency, otherwise we’re expected to stay until our actual scheduled time. Are either one of these an actual thing, or is it a scare tactic?