You cannot pop the return value of ->get_files because it is not an array.
pop @{[$fp->get_files]}
That should work, but should make the uselessness of this obvious: it constructs an array from the list returned by ->get_files, removes the last value from that array, and then throws the entire array away.
If this is part of File::Collector, I do not see a way for ->get_files to do what you seem to want, although you could add a ->get_file_queue method that returns a reference to the current file queue for a category. If I understand correctly, this would be return $s->{"_iterator_$type"} (but you should probably change your instance variables to make that return $s->{iterators}{$type} instead).
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