Hasan al-Basree said whoever says the kalimah and fulfills its conditions will enter Jannah.
Someone asked Wahb ibn Munnabih (d. 110), 'Is not laa ilaaha illa Allah the key to Jannah?' He replied, 'Yes, but every key has ridges, so if y ou come with the key that has the right ridges, the door will be opened for you, otherwise not.'