Learn Hardcore Swedish: Kan du stänga dörren, tack?

Kan: short a [a], “a” like in Italian “pasta.”
du: long fronted rounded vowel [dʉː] (pursed lips, high tongue).
stänga: ä ≈ [ɛ] (like “bet” but slightly tenser); ng = [ŋ] (as in “sing”); stress on the first syllable: [ˈstɛŋa].
dörren: ö short ≈ [œ] (like British “bird” but more fronted); double rr signals a <a class="border-b border-dotted border-blue-400 dark:border-blue-500 cursor-pointer text-inherit no-underline" href="/grammar/swedish/pronunciation/vowel-length">short vowel + long consonant: [ˈdœrːɛn].
tack: ck = long Yes/no questions typically have a rising final intonation; tack is lightly de-stressed.

You’re referring to a specific, contextually known door, so you use the definite form: dörr-en (the -en ending marks singular definite for this common-gender noun).