First, under the U.S. Constitution, Amendment 13, no person can be held to labor for another under threat of physical restraint or legal coercion.United States v. Kozminski, 487 U.S. 931 (U.S. 1988)
. Thus, the employer cannot prevent you from quiting your job. Period.
Second, under Ca Bus. & Prof. Code 16600, an employer cannot prevent an employee from changing employer. Noncompetition clauses in employment contracts are void/unenforceable.
That said, without reading your contract it's hard for me to be definitive -- however, I can't imagine what the employer could to do prevent you from changing jobs, whenever you wish.
Note: If you originally were employed outside of California, then it is possible to avoid enforcement of B & P Code 16600. But, if you were always employed by this employer in California, then the employer cannot prevent you from quiting.
Hope this helps.
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