Just create an open wifi called „free wifi” in any crowded place…
These are always the same tricks that work in a lab, but then when it comes to do an actual MITM on a web site - there are no solutions.
If my web site is www.example.com, you would need to get very close to the site (network topologically speaking) and insert yourself in the traffic. This is in practice undoable, except if you hack the local network where the web server lives (specifically some equipment) or the server itself.
Or hack the DNS server.
None of these are remotely easy with basic security in place.