But to answer your question, you can try close STDIN before running the command, assuming you don't need to get anything from STDIN elsewhere in your script.

First and foremost:

use strict;
use warnings;  # or -w
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Additionally, check the return of open (or die "Error: $!";), close INPUT, and verify that wzzip isn't the one waiting for 'press any key'...

Also, verify that you really want $zipfile = <INPUT> (returns a line from the file -- if this is the first such invocation, the first line). Depending on your implementation, you may want to use something like:

@zipfiles = <INPUT>;
foreach my $zipfile (@zipfiles) {
# unzip $zipfile
}
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Here is a function that I use in my scripts (it might be not the best way to do it, but it works...)

sub ZipFile($)
{
   my $fname = @_[0];
   my $error = 0;
   
   my $zipfile = $fname.'.zip'; #Update filename, add .ZIP at the end
   my $zip = Archive::Zip -> new();

   my $member = $zip->memberNamed( $fname );
   if ($member eq undef) #No existing zip file with the file inside
   {
      $member = $zip->addFile( $fname ) or $error = 1; #Add file to ZI
+P archive
      push @ERRORS, "Unable to zip $fname: $!\n" if $error;
      LogError() if $error; 
   }

   $member -> desiredCompressionLevel( 9 );
   my $status = $zip -> overwriteAs($zipfile);
   
   push @LOG, "$fname compressed (zipped) successfully\n";
   return $zipfile;  #Return updated filename
}
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Hope this helps :)