How do I open the keyholes?

How do I open the keyholes? - From above of cellphone with Have Less Do More inscription on screen near empty notebook and bottle of water

How do I open the keyholes found in each chapter?

This is the second keyhole I’ve found and I cannot figure out how to open it.

the-end-is-nigh

Pictures about "How do I open the keyholes?"

How do I open the keyholes? - White and Red Paper Document

How do I open the keyholes? - Orange Paper on White Surface

How do I open the keyholes? - Closeup Photo Black Door Yes We Are Open Signage

Euro Cylinder - Key on the Inside

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Images: Anete Lusina, Karolina Grabowska, Karolina Grabowska, Artem Beliaikin