Foo.php

<?php

class Foo {

    private $closure;

    public function __construct(Closure $closure)
    {
        $this->closure = $closure;
    }
    
    public function __invoke(array $args = [])
    {
        // This does not work: $this->closure(...$args);
    
        // Have to get the closure first?
        $closure = $this->closure;

        return $closure(...$args);
    }
}