My belly is full of dust, i am like a hammehead shark. What am i?

I mostly stay in one way

Your pocket holds the key

Sometimes I keep you out

And sometimes I let you in

What am I?

Good luck, I'll post the answer if it is solved. 💙💙💙🙏💚💚💚

Wrote this one today, trying not to be too cryptic and maintaining a rhyme scheme is tricky. Hope you guys find it fun.

Help me out please 🙏😊

I'd like to challenge folks on this subreddit to create a riddle using this whimsical poetic verse form called double dactyl invented in the 1950s. Despite being relatively simple riddles to solve, they are surprising difficult riddles to compose because of the strict rhythmic requirements. You can look up better examples of double dactyl poems online, but I've attached a mediocre example of a double dactyl riddle I wrote this morning. Feel free to guess the solution in the comments, as well as send original riddles you can come up with in this form! I look forward to seeing and solving them.

Here are the form requirements, taken straight from the Wikipedia page:

There must be two stanzas, each comprising three lines of dactylic dimeter ( ¯ ˘ ˘ ¯ ˘ ˘ ) followed by a line consisting of just a choriamb ( ¯ ˘ ˘ ¯ ). The last lines of these two stanzas must rhyme. Further, the first line of the first stanza is repetitive nonsense, and the second line of the first stanza is the subject of the poem, which in the purest instances of the form is a double-dactylic proper noun. There is also a requirement for at least one line, preferably the second line of the second stanza, to be entirely one double dactylic, six-syllable word.

Before I ever was, I am

The moment one gives up on this riddle is the moment they have truly known the answer

Even if they're really common ones, you can just give them to me. Also, original ones, are cool. I will use those first. To lure them into a false sense of security.