A logic level FET is a nice solution, only one component needed. Use an N-channel device, source goes to ground, gate to the output pin of the PIC, drain to the relay coil. Other side of relay coil to +5v. Be sure to connect a diode across the relay coil to deal with bach EMF, or you will destroy thr FET the first time you switch off.
If you do not need the isolation of a relay, power FET' s will handle a lot of current- tens of amps is common.
Best of luck!
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