What has Keys but doesn't unlock anything, what Has space but no room, and y!

Question:

What has Keys but doesn't unlock anything, what Has space but no room, and you can enter but not come in??

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This is an AWESOME riddle! I just wanted to see if anyone knew what it was???? If you get it right i will put yours as the best answer!

Answers: keyboard..it wasnt that hard computer keyboard? BTW,I got it first, too dumb to spell too,to. Hmmm, good riddle! But I read other peoples answers first! I would have had to take a while to figure it out... good one! keyboard a keyboard! A keyboard. Nice riddle. ;) Haven't heard that one before.

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