OK, so you have options for your options based on things, like maybe the date. I must be dense today, but I can't see how sorting would help unless you have cleverly named your sections (as in your example) and then do:

my $template;
while ( I am looping through Sections) {
  next unless first half of name is 'until';
  next unless date in second half of name hasn't passed yet;
  $template = this_Section->{TEMPLATE};
  last;
}
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But for the OP, how would

foreach $ini_sect ( sort keys %ini_file ) {
  %$ini_sect = %{ $ini_file{$ini_sect} };
}
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be any better than

foreach $ini_sect ( keys %ini_file ) {
  %$ini_sect = %{ $ini_file{$ini_sect} };
}
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??