Wahb ibn Munnabih was asked:

"Isn’t La Ilaha Ila Allah the key to Jannah?" ^[1]

He responded: "But of course, but there is not a key except that it has ridges, so if you bring a key with [the correct] ridges, [the door] would be opened for you, otherwise it would not be opened."

Meaning that simply saying the statement of Tawheed, without what it necessitates, without its conditions, is like a key without ridges, and only a key with ridges can open a door.

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[1] On the authority of Mu'aadh ibn Jabal who said; the Messenger of Allah said:

"The key to Jannah is the proclamation of 'Laa Ilaaha Illa Allah'."

[Collected by al-Imam Ahmad in his Musnad.]