How do I get Pod::Simple to extract pod from its containing file?

[Karl Williamson]

With Pod::Parser, you just do
        parse_from_file($in_fh, $out_fh)
and it outputs the pod to $out_fh.  Pod::Simple has a method of the same 
name which is supposed to emulate the Pod::Parser method, but when I run 
it, nothing is output.