Serialization of 'Closure' is not allowed when using php's time()

I keep running into:

Serialization of 'Closure' is not allowed

when dispatching a Job in Laravel. I have narrowed down the culprit to PHP's time() function.

There is a function in my Job's that is causing this. I have debugged it down to these specifics:

Causes error

$this->myProp = time() + $someDelay;

No error:

$this->myProp = 123 + $someDelay;

Any help would be awesome :)

via Chebli Mohamed