Unable to unlock account despite the use of UnlockUser() method.

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C#

ASP.NET

I am creating an e-commerce website project using asp.net. I had created a login.aspx file which inside contain a login control(build inside LoginView). And user would had they account locked if they had 2 invalid password attempts within 1 min(for testing purposes). I managed to achieve this, and in the ASPNETDB, the "IsLockOut" column had changed to "True".

However, I have encountered problem with unlocking user's account. I have used the UnlockUser() method but it seem not to be working. Even if one minute had passed, user still could not logged in into the system.

This is my code behind :

protected void Login1_LoggingIn(object sender, LoginCancelEventArgs e)
{
    System.Web.UI.WebControls.Login Login1 = (System.Web.UI.WebControls.Login)LoginView1.FindControl("Login1");
    TextBox UserName = (TextBox)Login1.FindControl("UserName");

    //Check to see if the current user exists
    if (Membership.GetUser(Login1.UserName) != null)
    {
        //Check to see if the user is currently locked out
        if (Membership.GetUser(Login1.UserName).IsLockedOut)
        {
            //Get the last lockout  date from the user
            DateTime lastLockout = Membership.GetUser(Login1.UserName).LastLockoutDate;

            //Calculate the time the user should be unlocked
            DateTime unlockDate = lastLockout.AddMinutes(Membership.PasswordAttemptWindow);

            //Check to see if it is time to unlock the user
            if (DateTime.Now > unlockDate)
                Membership.GetUser(Login1.UserName).UnlockUser();
        }
    }
}

web.config:

<add name="ASPNETDBConnectionString1"
    type="System.Web.Security.SqlMembershipProvider"
    connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\ASPNETDB.MDF;Integrated Security=True;User Instance=True"
    minRequiredPasswordLength="8"
    minRequiredNonalphanumericCharacters="0"
    requiresUniqueEmail="false"
    requiresQuestionAndAnswer="true"
    passwordFormat="Hashed"
    enablePasswordRetrieval="false"
    enablePasswordReset="true"
    maxInvalidPasswordAttempts="2"
    passwordAttemptWindow="1"

    />