Спросить/Спрашивать are used with "у" + Genitive
When asking for an object, use "просить" + "у" + Genitive. The object you need is in Accusative. If it is some amount of "stuff" (eg. water), Genitive can also be used instead of Accusative
When asking for an action to be performer, use "просить" + Accusative + infinitive or subjunctive (with "чтобы").
"Спроси ему" is rarely used, and not in the meaning you need here .
BTW, «закрывается» is spelt with an Ы, same as other words based on -КРЫ- root("cover"). You might know the word "крыша" (roof) — it is also related to "крыть"-verbs.