```{index} single: unlock_value (Hash::Util) ``` ```{index} single: Hash::Util::unlock_value ``` # unlock_value Undo a previous `lock_value`, making the value at `$key` writable again. ## Synopsis ```perl unlock_value(%hash, $key); ``` Does nothing (silently) if the value was never locked; an absent key is created with an `undef` value, or croaks if a locked keyset does not allow it. Returns a reference to the hash.