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Users are most commonly locked out when the Membership.MaxInvalidPasswordAttempts is reached within the Membership.PasswordAttemptWindow.
Users can also be locked out if you use the MembershipUser.GetPassword(string) or MembershipUser.ResetPassword(string) overload that accepts a password answer and the number of bad answers entered by the user reaches the Membership.MaxInvalidPasswordAttempts within the Membership.PasswordAttemptWindow.
The default value for the MembershipUser.LastLockoutDate property is determined by the membership provider. For example, when a membership user is created using the System.Web.Security.SqlMembershipProvider provider, the MembershipUser.LastLockoutDate property for the user is initially set to 01/01/1754.