Al-Bukhari reported: It was said to Wahb, “Is not the key to Paradise the statement: There is no god but Allah?” He said, “Of course, but rather every key has ridges. If you come with the correct key, the door will be opened for you; otherwise, it will never be opened.”

Source: Sahih Bukhari 1180

Grade: Sahih (authentic) according to Al-Bukhari

روى البخاري قِيلَ لِوَهْبِ بْنِ مُنَبِّهٍ أَلَيْسَ لَا إِلَهَ إِلَّا اللَّهُ مِفْتَاحُ الْجَنَّةِ قَالَ بَلَى وَلَكِنْ لَيْسَ مِفْتَاحٌ إِلَّا لَهُ أَسْنَانٌ فَإِنْ جِئْتَ بِمِفْتَاحٍ لَهُ أَسْنَانٌ فُتِحَ لَكَ وَإِلَّا لَمْ يُفْتَحْ لَكَ

1180 صحيح البخاري كِتَاب الْجَنَائِزِ بَاب مَا جَاءَ فِي الْجَنَائِزِ وَمَنْ كَانَ آخِرُ كَلَامِهِ لَا إِلَهَ إِلَّا اللَّهُ