The cassette player in an IM4006 or IMA4406 is constructed from 129 individual parts. Most of the parts are made from plastic and are easily broken if they are forced.
The shiny buttons (keys) can be replaced if the levers they are attached to are broken.
The door should NEVER be pried open if it will not release on its own. This will break the door latch and the the door will no longer latch closed.