micra 2003 keyless - hard to turn the key to start it.

Hi all, had a micra 2003 keyless (39,000 miles) drove it for two years but now it's hard to turn the key far enough to start it. it looks like something stopping the key to turn around. went to two mechanics one of them replaced a piece and the other removed the same piece but keep it electrically connected. I read some threads here in the forum but can't find permanent solution. Could some one help me to find a solution for that as or I have to go Nissan for that. also any one knows how much that will cost if I go to Nissan.

the key/knob DOES NOT TURN and on the dashboard the GREEN "KEY" INDICATOR IS LIT

Regards
 
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