Is this:

while(<DATA>) {
  push @array [$first, $last, $address, $city, $zip];
}
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meant to read data from a file?

You never set the values of $first, $last etc. Assuming that what you mean to do is read 5 values from a file and put the array containing those vlaues in @array then you should do something like:

while(<DATA>) {
  push @array, [split];
}
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p.s. are @array and @data supposed to be the same thing?