How can I get and over the shoulder camera much like when shift lock is on?

I'm trying to give my game that classic over the shoulder camera view but i cant find anything to help, all of it is outdated from the new camera script system. So if someone has a source that would help me or can explain to me what i need to do it would be much appreciated! Or if there's a better way to get the same camera without shift lock (because a lot of it seems to revolve around it) then that would also help.