I'm trying to create a log file, to log phone numbers in the file that aren't 10 digits, been searching the documentation on adding an array variable into the log file, but had no such luck , I need some guidance.

# Read in all rows from existing file
    my $rows = read_excel($in_file);
    
    my $headers = [
    "source_id",
    "first_name",
    "middle",
    "last_name",
    "address1",
    "city",
    "state",
    "postal_code",
    "phone_number",
    "address3",
    "province",
    "email",
    ];
    my $CA_zip = 19005;
    
        
    
    # Update the rows
    for my $row (@$rows) {
        if ($row->[6] eq 'CA' && ! $row->[7]) {
            $row->[7] = $CA_zip;
        }
        elsif ($row->[8] >10 || $row->[8] < 10) {
           my $a = ($rows);
        }
    }

    # add headers as first row
    unshift(@$rows, $headers);

    # Write the updated rows to new file
    my $col_num = scalar @$headers - 1;
    write_excel($out_file, $rows, $col_num);


    sub read_excel {
        my ( $file, $sheet ) = @_;
        $sheet ||= 0;
    
        my $parser = Spreadsheet::ParseXLSX->new();
        my $workbook = $parser->parse($file);
        if ( not defined $workbook ) {
            die $parser->error;
        }
 
        my $worksheet = $workbook->worksheet($sheet);
 
        my ( $row_min, $row_max ) = $worksheet->row_range();
        my ( $col_min, $col_max ) = $worksheet->col_range();
 
        my @rows;
        for my $row ( $row_min .. $row_max ) {
            my @cells;
            for my $col ( $col_min .. $col_max ) {
                my $cell = $worksheet->get_cell( $row, $col );
                if (not $cell) {
                    push(@cells,'');
                    next;
                }
                my $value = $cell->value();
                push(@cells,$value);
            }
            push(@rows,\@cells);
        }
        return \@rows;
    }

    sub write_excel {
        my ( $file, $rows, $col_max ) = @_;
    
        my $workbook = Excel::Writer::XLSX->new( $file );
        if ( not defined $workbook ) {
            die "Could not open file: $!";
        }

        my $worksheet = $workbook->add_worksheet();
        my $worksheet2 = $workbook->add_worksheet();
        my $row_num = 0;

        for my $row ( @$rows ) {
            for my $col (0 .. $col_max) {
                $worksheet->write( $row_num, $col, $row->[$col] );    
            }
            $row_num++;
            use Log::Log4perl qw(get_logger);
                #Defining configuration
            my $config = q(
            log4perl.logger                    = ERROR, FileApp
            log4perl.appender.FileApp          = Log::Log4perl::Append
+er::File
            log4perl.appender.FileApp.filename = test.log
            log4perl.appender.FileApp.layout   = PatternLayout
            log4perl.appender.FileApp.layout.ConversionPattern = %d> %
+m%n  $a
            );
                #logging behavior
            Log::Log4perl->init( \$config );
            
            my $logger = Log::Log4perl::get_logger("");
            $logger->error("Oh my, a dreadful error!");
            $logger->warn("Oh my, a dreadful warning!");
        }
        
        $workbook->close();
        return;
    }
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