Døren sitter fast, så jeg kan ikke åpne den.

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Breakdown of Døren sitter fast, så jeg kan ikke åpne den.

• den: it
• kunne: can
• ikke: not

Questions & Answers about Døren sitter fast, så jeg kan ikke åpne den.

Why is it døren and not en dør or dør?

Døren is the definite form: the door.

• en dør = a door (indefinite)
• dør = door as a general concept, or in compounds/signs (less common as a standalone noun in normal sentences)
  In this context you mean a specific door, so Norwegian naturally uses the definite form: Døren sitter fast.

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What does sitter fast literally mean, and why use sitter (sit) for a door?

Literally, sitte fast is to sit stuck / to be stuck fast. In Norwegian it’s a very common idiom meaning to be stuck (jammed, wedged, seized).
Norwegian often uses verbs like sitte, stå, ligge where English uses be:

• Døren sitter fast. = The door is stuck.
• Nøkkelen sitter fast i låsen. = The key is stuck in the lock.

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Could I also say Døren er fast?