I’ll get it

Boy: So, you cooked our dinner here?
Mom: Well, no, I didn't cook it here. I cooked it at home
and then I put it in the microwave to warm up.
Boy: Is it ready yet?
Mom: Not quite. Another few seconds.

(? ? ? ? ? ? ? ? ... microwave bell ringing)

Boy: I’ll get it.
Mom: No, it's not the doorbell, John. It's the bell of the
microwave. It means our supper is ready.

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What does "I’ll get it" mean?

Does it mean "I’ll open the door"?

Thank you