Your data structure doesn't look right to me, unless you really want to have multiple employee_numbers per ss_number.

Probably you want a hash with ss_number as the key and the value as either an array ref or hash ref with all the values associated with that ss_number. E.g.

 $myhash{'555236801'} = [3035, 2];
or
 $myhash{'555236801'} = { empno => 3035, years => 2 };
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Anyway, one easy way to get what you want is like this (at least on Unix (using the latter data structure:

  open SORTEDOUT, "|sort +2" or die "cannot open sort: $!\n";
  for (keys %myhash) {
    print SORTEDOUT $_, " ", $myhash{$_}{empno}, " ", $myhash{$_}{year
+s}, "\n";
  }
  close (SORTEDOUT) or die "Error on sort: $!\n";
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