回答
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"I went to the store to get my photos developed but they had already closed."
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"I went to the shop to develop my photos but it had already closed."
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"I went to get my photos developed but the shop had already closed."
"developed" - to develop 「現像する」
"already" 「すでに」
"store" と "shop" どちら使っても大丈夫で、"camera store" や "camera shop" も使えます。
一つ目の文 "...but they had already closed." の "they" はお店の店員さんがお店を閉店した事を表し、二つ目の文の "it" はお店がもう閉店した事を表します。
"photos" の代わりに "film" 「カメラフィルム」も使えます。"I went to the store to get my film developed..."