Of a door, etc, not locked (with a key), or that has been unlocked.(adjective)
Simple past tense and past participle of unlock.(verb)
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Use "unlocked" in a sentence
"If you ask most cell phone users what they understand the term "unlocked phone" to mean, they will likely tell you that it is exactly what it says: that you can use the phone on any cell carrier anywhere."
"And everything that has something crafted for it will remain unlocked from then on."
"Nich: Given that knowledge is power, I used to make it my business to read whatever documents I found lying about in unlocked offices whilst I was in prison."