Locks can happen by registrar (I.e.: ninjala, cloudflare, namecheap etc.) or registry (I.e.: gen.xyz, identity digital, verisign, etc.).
Typically, registry locks cannot be resolved through your registrar, and the registrant may need to work with the registry to see about resolving the problem. This could be complicated with Whois privacy as you may not be considered the registrant of the domain.
In all cases, most registries do not take domain suspensions lightly, and generally tend to lock only on legal issues. Check your Whois record’s EPP status codes to get hints as to what may be happening.