

Kannst du bitte schnell die Tür aufschließen?
[ˈkanst ˈduː ˈbɪtə ˈʃnɛl ˈdiː ˈtyːɐ̯ ˈaʊ̯fʃliːsn̩?]
Can you quickly unlock the door, please?
Ich habe die Wohnung schon aufgeschlossen.
[ˈɪç ˈhaːbə ˈdiː ˈvoːnʊŋ ˈʃoːn ˈaʊ̯fɡəʃlɔsn̩.]
I've already unlocked the apartment.
Es ist schwer, das alte Schloss aufzuschließen.
[ˈɛs ˈɪst ˈʃveːɐ̯, das ˈaltə ˈʃlɔs ˈaʊ̯ftsʊˌʃliːsn̩.]
It's hard to unlock the old lock.
"aufschließen" is in the lesson "Verbs 11" (Level 23), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.