my @ref = map{ ("key$_", "value1_$_", "value2_$_") } 0 .. 9;;

my $i=0; $h{shift @$_}=$_ while $i < @ref and $_=[@ref[$i++,$i++,$i++]];;

print "$_ => @{$h{ $_ }}" for sort keys %h;;
key0 => value1_0 value2_0
key1 => value1_1 value2_1
key2 => value1_2 value2_2
key3 => value1_3 value2_3
key4 => value1_4 value2_4
key5 => value1_5 value2_5
key6 => value1_6 value2_6
key7 => value1_7 value2_7
key8 => value1_8 value2_8
key9 => value1_9 value2_9