Allah says in Surah az-Zumar 39:63:

له مقاليد السماوات والأرض

To Him belong the keys of the heavens and the earth.

Ibn Katheer said this means:

أن أزمة الأمور بيده ، له الملك وله الحمد ، وهو على كل شيء قدير

That the control of all things is in the Hand of Allah, His is the dominion and to Him belongs all praise, and He is able to do all things.

In Arabic, the word translated here as “keys” is maqaaleed (مقاليد). The more common word for “keys” in Arabic is miftaah (pl. mafaatih), as in Surah al-An’am 6:59

عِندَهُۥ مَفَاتِحُ ٱلْغَيْبِ لَا يَعْلَمُهَآ إِلَّا هُوَ

And with Him are the keys of the unseen; none knows them except Him.

A few years ago my Quran teacher mentioned to me that the singular form of the word maqaaleed is iqleed (إقليد), which he said was an Arabized form of the Persian word kileed (کلید). This would make it one of the many Arabic words of foreign origin that were absorbed into classical Arabic prior to the Quran’s revelation.