Quoted: He may be able to push-process, but I doubt it, because the color development process is usually highly automated.
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NO no no no no.ASA/ISO 400 speed film exposed at 200 is an OVER exposure, push processing is for UNDER exposing. The proper correction would be to PULL process this film. A typical development time for C-41 film is 3minutes 15 seconds. A typical one stop pull would lower that time to 2 minutes 25 seconds.
You've overexposed your film by one stop, to correct for that it needs less development not more.
It's important to know what kind of film you shot because the recommendation will be different for each one.
C-41 process color/B&W negative film, you can skip making the correction, but if you were shooting under very contrasty lighting conditions you may want to have the correction made.
C-41 process color negative films tolerate overexposure very well, 5-6-7 stops of overexposure and the negative may still be printable although the end product will suffer greatly.
E-6 process transparency film the correction needs to be made.
K-14 process transparency film the correction needs to be made..
Traditional B&W films are all processed at various times depending on the film/developer combination so let your lab know what happened and they can make the correction easily. While traditional B&W films are tolerant of overexposure it's not to as great a degree as C-41 process color negatove films are although the same advice about the lighting conditions apply.
Walmart, etc will not be able to change their processing time to make an adjustment for you, their equipment won't easily allow for it. (I can though)
It's an every day thing for a professional lab though.