How to make my method execute a Closure

Hello,
I'm writing a custom function inside my action which should accept a Closure.

public function autofill(array|Closure $data): void
  {
      $this->url(AssignmentResource::getUrl('create', $data));
  }

public function autofill(array|Closure $data): void
  {
      $this->url(AssignmentResource::getUrl('create', $data));
  }

public function autofill(array|Closure $data): void
  {
      $this->url(AssignmentResource::getUrl('create', $data));
  }

public function autofill(array|Closure $data): void
  {
      $this->url(AssignmentResource::getUrl('create', $data));
  }

Right now this gives the error,

Object of class Closure could not be converted to string

Object of class Closure could not be converted to string

Object of class Closure could not be converted to string

Object of class Closure could not be converted to string. Looking at other methods I couldn't find a difference, how do you do this?