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Are you :

A piano?

I have keys, but I have no locks. :

piano keys

Some consider me majestic

piano can be majestic

Other find me annoying.

When badly played it sounds injuring

I can do back but not forward :

It is wordplay on Johann Sebastian Bach, the composer and pianist. Forward is not a composer!

I am happy.

I am sad.

I can hold you in suspense.

music transfers emotions, and piano is often used in high suspense movie music (e.g., Psycho's score for instance)

Are you :

A piano?

I have keys, but I have no locks. :

piano keys

Some consider me majestic

piano can be majestic

Other find me annoying.

When badly played it sounds injuring

I can do back but not forward :

It is wordplay on Johann Sebastian Bach, the composer and pianist. Forward is not a composer!

I am happy.

I am sad.

I can hold you in suspense.

music transfers emotions, and piano is often used in high suspense movie music (e.g., Psycho's score for instance)

2nd Shot for those three lines (thanks to comments from Mark A, and Peter)

Happy stands for Major Scale, Sad for minor scale, and the suspense bite stands for Suspended scale.

Are you :

A piano?

I have keys, but I have no locks. :

piano keys

Some consider me majestic

piano can be majestic

Other find me annoying.

When badly played it sounds injuring

I can do back but not forward :

It is wordplay on Johann Sebastian Bach, the composer and pianist. Forward is not a composer!

I am happy.

I am sad.

I can hold you in suspense.

music transfers emotions, and piano is often used in high suspense movie music (e.g., Psychosis for instance)

Are you :

A piano?

I have keys, but I have no locks. :

piano keys

Some consider me majestic

piano can be majestic

Other find me annoying.

When badly played it sounds injuring

I can do back but not forward :

It is wordplay on Johann Sebastian Bach, the composer and pianist. Forward is not a composer!

I am happy.

I am sad.

I can hold you in suspense.

music transfers emotions, and piano is often used in high suspense movie music (e.g., Psycho's score for instance)

Are you :

A piano?

I have key but no locks :

piano keys

Some consider me majestic

piano can be majestic

Other find me annoying.

When badly played it sounds injuring

I can do back but not forward :

It is a wordplay with Johann Sebastian Bach the compositor and pianist, forward is not a compositor !

I am happy.

I am sad.

I can hold you in suspense.

music transfer emotions, and piano is often used in high suspense movie music (aka Psychose for instance)

Are you :

A piano?

I have keys, but I have no locks. :

piano keys

Some consider me majestic

piano can be majestic

Other find me annoying.

When badly played it sounds injuring

I can do back but not forward :

It is wordplay on Johann Sebastian Bach, the composer and pianist. Forward is not a composer!

I am happy.

I am sad.

I can hold you in suspense.

music transfers emotions, and piano is often used in high suspense movie music (e.g., Psychosis for instance)