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Jyutping sat1 si4 gaap3 maan6
Pinyin shī shi jiā wàn

Definitions (粵典–words.hk)
  1. 名詞、舊式
    形容​甚或​諷刺​一個​人​雖然​屋企​好​有​錢​,​但​係​控制​唔​到​啲​錢​,​猶如​一個​人​有​一個​裝滿​錢​嘅​夾​萬​,​不過​無鎖匙​開​咁​。
    used to describe or even satire a person whose family is rich but who cannot control the family fortune, as if he had a safe full of money, but he had lost the key; literally: a safe whose key is lost
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    person from a rich family who does not have access to his or her family's wealth

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Jyutping sat1 si4 gaap3 maan6
Pinyin shī chí jiā wàn

Definitions (CC-CANTO)
  1. describes the situation where a son / daughter in a rich family is having difficulty in getting money from his/her parents (who are strict in financial); literally "a safe with no key"