i have done coding of how to block user account but not know about how to unblock it after 24 hrs

if(loginAttempt<4 && !loginStatus.equals("Locked") ){
                        statement = connection.prepareStatement("update user_data_management set attempt=?,status =? where user_code=? ");
                        if (loginStatus.equals("Logged"))
                            throw new UserAlreadyLoggedIn();
                        else
                            statement.setInt(1, loginAttempt);
                        statement.setString(2, "Open");
                        statement.setString(3,userID);
                        statement.executeUpdate();
                        throw new PasswordNotValidException();
                    }else{
                        statement = connection.prepareStatement("update user_data_management set status =? where user_code=? ");
                        statement.setString(1,"Locked");
                        statement.setString(2,userID);
                        statement.executeUpdate();
                        throw new UserLockedException("Your LoginId and Password is blocked");
                    }

                }
            }else
                throw new PasswordNotValidException();


        }catch (SQLException e) {
            e.printStackTrace();
            throw new DataRetrievalFailureException();