I am a box that holds keys without locks, yet they can unlock your soul. What am I?

Answer: A Piano.

More Riddles for Adults with answers

More Riddles for Adults

I am slim and tall, Many find me desirable and appealing. They touch me and I give a false good feeling. Once I shine in splendor, But only once and then no more. For many I am "to die for". What am I?
I am taken from a mine, and shut up in a wooden case, from which I am never released, and yet I am used by almost everybody. What am I?
I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business. What am I?
I like to be blue and have been since '63, but I could be anything if my circuit was fixed. I'm small yet infinitely bigger. I was grown but I'm made of metal. I am the last of my kind just like my beautiful idiot once was. Together we will travel, have traveled or are traveling. Tenses as seen, seeing, will see, are mysterious to me. Wibblies and wobblies, time correctly described by a Lord. What will I be, what have I been, or is it, what am I?
I weaken all men for hours each day. I show you strange visions while you are away. I take you by night, by day take you back, None suffer to have me, but do from my lack. What am I?
If you can buy 1 for $1, 14 for $2, and 145 for $3, what are you buying?
My life is often a volume of grief, your help is needed to turn a new leaf. Stiff is my spine and my body is pale, but I'm always ready to tell a tale. What am I?
Some try to hide, some try to cheat, but time will show, we always will meet. Try as you might, to guess my name, I promise you'll know, when you I do claim. Who am I?
Take one out and scratch my head, I am now black but once was red. What am I?
The land was white the seed was black It'll take a good scholar to riddle me that. What am I?
Thirty white horses on a red hill, First they champ, Then they stamp, Then they stand still. What are they?
What can be swallowed, but can also swallow you?