Latching interior café door
I am assuming that when you say you have a &quot;swing door&quot; you mean that it swings both ways. That would be called double acting, and most that I have seen in residential settings use an adjustable-tension ball or roller catch:

These are catches as opposed to latches, there is no positive connection. The tension is adjusted by screwing the ball in/out which changes the force the spring behind it applies. A smart dog with a head of steam might be able to head-butt it open, but if adjusted right it might knock him silly unless it's a bulldog.