Why all the excess complexity? sort { $h{$a} <=> $h{$b} } should be just fine here.

%hash = (processone => 1,
         processtwo => 0.005,
         processthree => 3);
@_ = sort { $hash{$a} <=> $hash{$b} } keys %hash;
print $_[0], ' => ', $hash{$_[0]}, " (lowest)\n";
print $_[-1], ' => ', $hash{$_[-1]}, " (highest)\n";
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