लॉकर बंद नहीं है।

• लॉकर = locker
• बंद = closed / shut
• नहीं = not
• है = is

So the structure is basically:

locker + closed + not + is

That sounds unusual in English, but it is normal in Hindi.

Hindi does not normally use articles like a, an, and the.

So लॉकर can mean:

• a locker
• the locker

The exact meaning depends on context.

In sentences like this, नहीं usually comes before the verb है.

So:

• लॉकर बंद है = The locker is closed.
• लॉकर बंद नहीं है = The locker is not closed.

This pattern is very common with adjectives and states:

• वह तैयार है = He/She is ready.
• वह तैयार नहीं है = He/She is not ready.

बंद usually means closed, shut, or sometimes off depending on context.

With लॉकर, it most naturally means:

• closed
• possibly shut

Sometimes English speakers may think of locked, but बंद does not always specifically mean locked. If you want to be very explicit about locked, Hindi often uses expressions like:

• लॉकर में ताला लगा है = The locker is locked.
• लॉकर लॉक है = The locker is locked. (common in modern speech)

So लॉकर बंद नहीं है is best understood as The locker is not closed/shut.

है is the singular form of to be in the present tense.

Since लॉकर is singular, Hindi uses है:

• लॉकर बंद है = The locker is closed.

If it were plural, you would use हैं:

• लॉकर बंद हैं = The lockers are closed.

Usually, बंद stays the same. It is commonly used as an invariable adjective.

So you can say:

• दरवाज़ा बंद है = The door is closed.
• खिड़की बंद है = The window is closed.
• दुकानें बंद हैं = The shops are closed.

Notice that बंद does not change form.

This is different from some other adjectives, which do change:

• खुला दरवाज़ा = open door
• खुली खिड़की = open window

But बंद normally remains बंद.

It is a borrowed word from English locker, written in Devanagari as लॉकर.

Hindi uses many loanwords from English, especially for modern objects and institutions. So this is very natural Hindi.

The spelling लॉ represents the lo/lock sound more closely than plain लो would.

It is pronounced roughly like law-kar or lo-kar, depending on accent.

A simple learner-friendly approximation is:

लॉकर → law-kur

And the whole sentence:

लॉकर बंद नहीं है
→ law-kur band na-heen hai

Exact pronunciation varies a bit by speaker, but that approximation is good enough for learners.

The structure is:

Subject + state/adjective + negation + copula

So:

• लॉकर = subject
• बंद = state/adjective
• नहीं = negation
• है = copula (is)

This is a very common Hindi pattern:

• कमरा साफ़ है = The room is clean.
• कमरा साफ़ नहीं है = The room is not clean.

Yes, but the meaning shifts a little.

• लॉकर बंद नहीं है = The locker is not closed.
• लॉकर खुला नहीं है = The locker is not open.

These are not always identical. In some situations they may imply similar things, but grammatically they are different ideas:

• one negates closed
• the other negates open

Hindi often prefers exactly the adjective that matches the intended meaning.

Sometimes in very casual spoken Hindi, people may drop है, especially in conversation:

• लॉकर बंद नहीं

But in standard, careful Hindi, लॉकर बंद नहीं है is the full and correct form.

For learners, it is best to keep है unless you are very familiar with colloquial speech.

No, that sounds unnatural in standard Hindi.

The normal order is:

• लॉकर बंद नहीं है

Not:

• लॉकर नहीं बंद है

For this kind of sentence, place नहीं before है, after the adjective/state word.