Cykelskuret er låst om natten, og lågen er lidt svær at åbne.

Because cykelskuret is the definite form: the bike shed.

• et cykelskur = a bike shed
• cykelskuret = the bike shed

In Danish, a neuter noun like skur takes -et in the definite singular form.

So:

• skur = shed
• skuret = the shed
• cykelskur = bike shed
• cykelskuret = the bike shed

It is a compound noun:

• cykel = bicycle / bike
• skur = shed

So cykelskur literally means bike shed. Danish uses compound nouns very often, much more freely than English.

Because Danish often uses to be + past participle to describe a state, just like English.

• er = is
• låst = locked

So er låst means is locked.

This is the normal way to say that something is in a locked state:

• Døren er lukket = The door is closed
• Vinduet er åbent = The window is open
• Cykelskuret er låst = The bike shed is locked

Låst is the past participle of at låse, meaning to lock.

• at låse = to lock
• låser = locks / is locking
• låste = locked
• låst = locked

In this sentence, låst works like an adjective after er:

• er låst = is locked

Om natten is the normal Danish expression for at night / during the night in a general sense.

• om natten = at night, during the night, nights

This is idiomatic Danish. English speakers often want to translate word-for-word, but here you should learn the whole expression.

Compare:

• om dagen = during the day / by day
• om morgenen = in the morning
• om aftenen = in the evening
• om natten = at night

I natten would sound unnatural in this context.

No. Om natten usually means at night in a general or habitual sense, not tonight.

So the sentence suggests something like:

• the bike shed is locked at night
• it is a usual rule or routine

If you want tonight, Danish would normally use i aften or another more specific time expression depending on context.

Låge means a gate, hatch, or a small door-like opening, often on a fence, enclosure, shed, or cabinet. It is not always the same as a normal house door.

• dør = door
• låge = gate / hatch / small door / access flap

So lågen suggests the particular kind of opening the bike shed has. In English, the best translation may vary depending on the object.

Because låge is a common gender noun, not a neuter noun.

• en låge = a gate / hatch
• lågen = the gate / hatch

Compare:

• en dør → døren
• et skur → skuret

So:

• cykelskuret ends in -et because skur is neuter
• lågen ends in -en because låge is common gender

Lidt means a little, slightly, or somewhat.

So:

• lidt svær = a little difficult
• more natural English: a bit hard / slightly difficult

In this sentence, lidt softens the statement. It does not say the gate is extremely difficult to open, only somewhat difficult.

Because svær agrees with lågen, and lågen is a common gender singular noun.

• en låge → common gender singular
• adjective form after er: svær

Compare:

• Lågen er svær = The gate is difficult
• Skuret er svært = The shed is difficult

Here is the pattern:

• common gender singular: svær
• neuter singular: svært
• plural / definite in many contexts: svære

Because Danish uses adjective + at + infinitive in many cases, similar to English difficult to open.

• svær at åbne = difficult to open
• nem at forstå = easy to understand
• god at læse = good to read
• klar til at gå = ready to go

So at åbne is simply the infinitive to open.

It is not a full passive form here. It means that the gate is difficult for someone to open.

So:

• Lågen er lidt svær at åbne = The gate is a bit hard to open

English uses the same type of structure:

• This book is easy to read
• The bottle is hard to open

The object (lågen) is understood as the thing being opened.

Because this is a straightforward main clause + main clause structure joined by og (and):

• Cykelskuret er låst om natten
• og
• lågen er lidt svær at åbne

Each clause has normal main-clause word order:

• subject + verb + other elements

Danish word order becomes more noticeably different from English when adverbs or subordinate clauses move elements around, but this sentence is quite simple.

Normally you would keep og, because it connects the two statements naturally:

• Cykelskuret er låst om natten, og lågen er lidt svær at åbne.

Without og, the sentence would feel more abrupt or less smooth. The conjunction tells you that the second statement adds more information about the same situation.

Å is a separate letter in Danish. It is not just a with an accent.

• åbne = to open
• å is pronounced roughly like the vowel in English more or saw, though not exactly

The word åbne is commonly pronounced approximately like OHB-neh, but with a distinctly Danish vowel and a softer ending.

The important thing for learners is:

• å is its own letter
• it often represents a rounded vowel sound
• many common Danish words use it: år, båd, låst, åbne

Yes: the comma separates two coordinated main clauses.

• Cykelskuret er låst om natten
• og lågen er lidt svær at åbne

In Danish, commas are often used in places that may feel slightly different from English depending on style and comma rules taught. In a sentence like this, the comma before og is normal and clear.

Yes, it is natural and idiomatic Danish.

It sounds like a normal practical statement, for example on a notice, in conversation, or in an explanation about using a shared bike shed. Nothing in the sentence is odd or overly formal.