Laravel transaction return null

I am trying to query with db transaction .When my method run that time data inserted correctly in corresponding table.but it return null.

My Code

    return $result = DB::transaction(function() use ($attributes) {
        $service = $this->service->create($attributes);
        $visibilityAttributes = $attributes['dropdown_option_id'];
        $visibilityAttributes = array_map('intval', $visibilityAttributes);
        $service->visibility()->sync($visibilityAttributes);
    },3);

DB::transaction() returns whatever the closure passed into it returns. Since your closure doesn't return anything, DB::transaction() will return null. You need to add a return statement to your closure.

return $result = DB::transaction(function() use ($attributes) {
    $service = $this->service->create($attributes);

    $visibilityAttributes = $attributes['dropdown_option_id'];
    $visibilityAttributes = array_map('intval', $visibilityAttributes);
    $service->visibility()->sync($visibilityAttributes);

    // This value will be returned from DB::transaction().
    return $service;
},3);