I have a function where I put network task into dispatch group, and then use .wait() to not return value until this task will finish but it don't work. Does anyone have suggestions how to fix this? Thanks in advance!

class PunkApiService{

    var beers = [Beer]()

    func loadList(at page: Int){
        //MARK: - Checks is URL is valid + pagination
        guard let url = URL(string: "https://api.punkapi.com/v2/beers?page=\(page)&per_page=25") else {
            print("Invalid URL")
            return
        }
        //MARK: - Creating URLSession DataTask
        let task = URLSession.shared.dataTask(with: url){ data, response, error in
            //MARK: - Handling no erros came
            guard error == nil else {
                print(error!)
                return
            }
            //MARK: - Handling data came
            guard let data = data else{
                print("Failed to load data")
                return
            }
            do{
                let beers = try JSONDecoder().decode([Beer].self, from: data)
                self.beers.append(contentsOf: beers)
            }
            catch{
                print("Failed to decode data")
            }
        }
        task.resume()
    }
}

class BeersListInteractor:BeersListInteractorProtocol{
    private var favoriteBeers = FavoriteBeers()
    private var service  = PunkApiService()
    //MARK: - Load list of Beers
    func loadList(at page: Int) -> [Beer]{
        let group = DispatchGroup()
        group.enter()
        DispatchQueue.global().sync{
        self.service.loadList(at: page)
        group.leave()
        }
        group.wait()
        return service.beers

    }