Are you sure you locked the gate? You could easily have forgotten.

你肯定锁上大门了吗？你很可能是忘了。

《牛津词典》

The huge, iron gate was locked.

那扇巨大的铁门被锁上了。

《柯林斯英汉双解大词典》

While Frank was admiring the beauty of a flower, a little boy came to the gate and finding it locked, he shook it hard.

当弗兰克正在欣赏一朵美丽的花时，一个小男孩走到门口，发现门是锁着的，他使劲摇了摇。

youdao

North London Coroner's Court heard an ambulance was delayed by 30 minutes as a park gate was locked.

BBC: London Ambulance Service vehicle

Many suffocated in the crush of bodies that formed as fans attempting to flee the stadium found their escape blocked by a locked steel gate, survivors said.

CNN: Anger flares in Egypt after 79 die in soccer riot

They waited till Gerry locked the gate.

NEWYORKER: Bullfighting