lock and key

so many years have passed since i found that special key. in all these years ive received key after key from friend and stranger alike.....and until today, i had never received a lock.

in the basement, ....like children we go explooring....he pulls out a lock and gives it to me.....tells me he came upon it haphazardly.....then pulls a pair of keys from the closet and gives them to me.....tell me boy, what does this all mean....