Machine locked after I cleaned/oiled replaced plated, wheel locked

If it is seized it needs oil. Take it to your local technician

Is the motor straining? If so, do not continue to force the motor to run the machine. It could burn it out and you will then be replacing the motor in addition to repairing the other problem.

Is your machine mechanical or computerized? If computerized, check that no thread is wrapped in the bobbin area or around the handwheel. May need to be taken to a technician for repair.

If mechanical, the machine could be seized due to lack of regular cleaning and oiling. With a soft brush, remove any lint, dust, thread pieces, fuzz, etc. from the bobbin area, the feed dogs, and under the needle plate. Then oil:
Need to know where to oil parts in my oldie but goodie Kenmore Do not have...

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There may be thread wrapped around the handwheel, preventing it from moving.

Are you able to remove the bobbin from the winder? Perhaps that will help release the machine.

Is your machine an older mechanical machine (NOT computerized)? If so, have you cleaned and oiled it recently? Old oil will dry out and eventually turn to a glue-like substance, eventually freezing the moving parts. Consult your owner's manual and follow the instructions using ONLY fresh, good quality sewing machine oil (if yours is dark yellow or brown, it is old--THROW IT OUT!). If your machine is mechanical, it could very well be that the handwheel is frozen from lack of maintenance.

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With no make or model, it's guessing. First remove throat plate under presser foot that needle passes through, check for lint on feed dogs and in between feed dog teeth. Next l would oil feed dog mechanism, turn hand-wheel with throat plate removed and look for parts that rub. Lubricate with sew machine oil. Hope it helps.

Try to turn the hand wheel backwards possible thread stuck on the needle hook by the bobbin. Take the bobbin out and remove the face plate and clean machine.

Make sure the top thread is in the take up lever.

then I suggest having the machine serviced to see what the
problem is, it could be a broken part or a part that is loose
or may need some type of adjustment.

all newer machines require little maintence except in the bobbin area, and the area above the needle. simply place a few drops on the shaft that allows the needle to go up and down and keep lint free, you can use canned air for this. The area below the cover plate and the bobbin case need cleaned after every 8 to 10 hours of sewing. you can remove the cover plate by removing the two screws the plate should lift up so you can clean the feeddogs and bottom of plate, if you remove the bobbin at the same time you can clean this area and oil the center of bobbin area of machine , oil any parts the move or have oil ports, these are very small and look like a nut with a hole in the center, one or two drops are all that is needed. replace all parts and test a scrap piece to make sure no oil gets on current project.

start with a deep clean and oil. check tensions, top and bottom-stitch should "lock" inside the fabric. make sure you use same thread on bobbin as on the machine. Check needle for nicks or bent. Make thread is threaded correctly, passing through upper tension plate. check tension plate(upper) for rust or lint.

When you removed and replaced the throat plate, bobbin and bobbin case to clean the shuttle and surrounding area, did you have the needle at it's highest position?

If the bobbin case is not properly re-installed, the hand wheel is affected.

If all of the above has been done and the handwheel is still locked up, the machine will need to go into the shop for service.

This is an expensive, computorized machine and any additional hands-on troubleshooting could add up to a costly repair fee.