Implementation of Identity in existing project - Not working

I have a project for a virtual store. The store already exists today in ASP and I'm migrating to .NET. I have the intention of using the authentication control of the .net itself, however when I started the project, I started a blank (without authentication), and now I am trying to implement.

I have already found some tutorials on the internet that I tried to follow, but so far none have been able to make the solution work.

Let's go to what I have ready so far. I already installed in my project, as I found guidelines:

Microsoft.AspNet.Identity.EntityFramework
Microsoft.Owin.Security
Microsoft.Owin.Host.SystemWeb

I have already changed my model that I want to use to login to be IdentityUser :

public partial class clientes : IdentityUser
{
    public decimal ID_CLIENTE { get; set; }
    public string NOME { get; set; }
    public string EMAIL { get; set; }
...
}

I've already created my startup:

using Microsoft.AspNet.Identity;
using Microsoft.Owin;
using Microsoft.Owin.Security.Cookies;
using Owin;
using EmocioneJa.Models;
using System;
using Microsoft.AspNet.Identity.EntityFramework;

[assembly: OwinStartup(typeof(EmocioneJa.Repositories.Startup))]

namespace EmocioneJa.Repositories
{
public class Startup
{
    public static Func<UserManager<clientes>> UserManagerFactory { get; private set; }

    public void Configuration(IAppBuilder app)
    {
        // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=316888
        app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
            LoginPath = new PathString("/Cadastro/Login")
        });

        UserManagerFactory = () =>
        {
            var usermanager = new UserManager<clientes>(new UserStore<clientes>(new emocionejaEntities()));
            // allow alphanumeric characters in username
            usermanager.UserValidator = new UserValidator<clientes>(usermanager)
            {
                AllowOnlyAlphanumericUserNames = false
            };

            return usermanager;
        };
    }
}
}

My Controller looks like this:

[AllowAnonymous]
public class CadastroController : Controller
{
    private readonly UserManager<clientes> userManager;

    emocionejaEntities _db;

    public CadastroController()
        : this(Startup.UserManagerFactory.Invoke())
    {
        _db = new emocionejaEntities();
    }


    public CadastroController(UserManager<clientes> userManager)
    {
        this.userManager = userManager;
    }

public async Task<ActionResult> FazerLogin(string email, string senha)
    {
        funcoes fc = new funcoes();
        string _nextPage = "";

        senha = funcoes.Base64Encode(senha);

        var user = await userManager.FindAsync(email, senha);

        if(user != null)
        {
            var identity = await userManager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie);
            identity.AddClaim(new System.Security.Claims.Claim("ID_CLIENTE", user.ID_CLIENTE.ToString()));

HttpContext.Request.GetOwinContext().Authentication.SignIn(identity);
        }
    }
}

The problem is when you get to the line:

var user = await userManager.FindAsync(email, senha);

Because he does not even make a mistake and does not even go forward. The system simply hangs there.

After catching a little, I also tried to create the file identityConfig.cs , and in class ApplicationUsarManager , I had to use my own class (clients), but it also did not work:

public class ApplicationUserManager : UserManager<clientes>
{
    public ApplicationUserManager(IUserStore<clientes> store)
        : base(store)
    {
    }
}

Can anyone help me?

If you need more information, let me know.