In my last job, boss would pretty often come up with something important to do near the end of my shift. Watch out for that. How do you deal when your employer

In my last job, boss would pretty often come up with something important to do near the end of my shift. Watch out for that. How do you deal when your employer (it was a small company) engages with you personally when your shift is coming to an end? Discussing, planning, that sort of thing. I could set my borders with others well enough, but at workplace it's a delicate thing.