Try something like:

# Page Layout - Legal, Landscape
our %landscape_lgl = (
                        set_paper => [5],
                        set_landscape => [],
                        set_margins_LR => [.50],
                        set_center => [],
                        set_hide_gridlines => [],
                        set_fit_to_pages => []
                    );
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and

foreach my $statement (keys(%landscape_lgl)) {
    $worksheet->$statement(@{$landscape_lgl{$statement}}),
    print "$worksheet->$statement","\n";
}
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This will not preserve the order of your statements in the %landscape_lgl hash. If you need to do that, have a separate array:

@landscape_lgl = qw/set_paper set_landscape.../
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And use that in place of the keys() part.

Alternatively, keep your original loop, but instead of the $worksheet->$statement call in the foreach body, use

eval $statement;
warn "something went wrong in $statement: $@" if $@;
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All code untested.