And I love you Kendrick, if I don't hear you knocking on the door you know where I usually leave the key. Alright? Talk to you later, bye."

from Kendrick Lamar (Ft. Anna Wise) – Real Lyrics on Rap Genius

Meaning

Kendrick’s mother continues to be hopeful (even though you can hear the sadness in her voice) and tells him that the key is where it normally is, in case he’s forgotten.

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