How to impersonate a user and insert a calendar in its behalf using service account?

I'm trying to create calendars and share them with my organization's users using a service account.
I thought a service account could have it's own calendars but it gives me a 404 error when i try to "insert" new calendars.
So i thought I could create a dumb user account, impersonate it with a service account and then create and share my calendars.
Is it the right way to proceed? Am I missing something?
If my last guess is right how can I achieve it using laravel and google-api-clients for PHP?

Thank you for your advices

via Chebli Mohamed