Try changing the key fob battery as it may not have enough power to send the signal to unlock the car but it still may have enough to flash the red light.
Prius v door lock problem.
2012 2013 prius v common problems.
A 2013 toyota prius v.
The average cost for a toyota prius door lock actuator replacement is between 372 and 547.
Estimate does not include taxes and fees.
Overheated hybrid inverter assembly.
The key will not open your car if the deadlocks were set on it but try changing the fob battery as this may be the quickest and cheapest fix to try first.
As mentioned in the 2014 prius v common problems entry above the hybrid inverter assembly which is the part responsible for supplying power from the battery to the engine is prone to overheating.