please try "needle nosed" pliers.. it may also be a label peeling off inside the player
How do I remove cassette tape stuck in my 1998 Volkswagon beetle
You are probably going to have to remove the radio and take the top off to gain access to the tape. It has probably broken and the tape is fouled.
I suggest getting a portable cassette player and hook it up to a FM transmitter. However, it would be much less of a hassle to buy a different stereo for your car that has a cassette player.
An outdated form of storage. It had a magnetic tape inside where the recording was recorded.