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When I first saw the image, I thought of a few of the shrubs in my own garden. I'm also in MN and have stunted and similar growth on my Lil Kim Lilacs as well as Verbena, St John's Wort and Weigela.
Wait it out. Extra watering if you are dry, that has helped mine catch up.
Give a feeding of a balanced fertilizer also.

I believe our weather last year and winter length are the reasons for these issues.
We were well below zero most of the winter, which brings our growing zone down.
Plants are showing the effects.
Good luck and happy gardening, neighbor!

All plants suffer transplant shock, a period where leaves wilt and droop. It takes a while for roots to readjust to their new location. Soil should be moist but not soggy. Either stick your finger 2 inches down or use a trowel to assess moisture level. I personally wait on fertilizing until the plant shows signs of recovery and new growth. The roots must have priority over top-growth. Dead-head the flowers if not already done. If you can rig up some shade with an old sheet or a lawn bag over your shovel, all the better. At 2 weeks, as long as weather isn't harsh, you should be seeing your shrub recover any day now. This entire growing season, it sill need supplement water during dry periods, windy days and high heat days.

It is very possible that it will need some pruning to restore this plant. These two articles will help:

https://www.gardeningknowhow.com/ornamental/shrubs/lilac/pruning-lilac-bushes-when-to-trim-lilac-bushes.htm
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-care-growing-and-planting-lilac-bush-plants.htm

This article will help you with pruning.

https://www.gardeningknowhow.com/ornamental/shrubs/lilac/pruning-lilac-bushes-when-to-trim-lilac-bushes.htm

Can you include a photo? There is a good chance that the soil has been rendered extremely acidic by the treatment. I would suggest adding dolomitic lime to balance that out. It will help recondition the soil and protect it from pH swings. Also, adding a little powdering of wettable sulfur to the soil will help kill off anything lurking there.

This article will give you information on the care of these plants: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-care-growing-and-planting-lilac-bush-plants.htm

As long as you trim lilac before July 4th, you won't remove next year's blooms. Why your lilac didn't bloom this year is a separate matter, I believe. Lilacs can get tall and rangy so pruning is necessary. Removing just the outer parts to contain size is taking out flower-producing young wood. Instead, control the size by annually removing 1/3 of the largest branches to the ground. This technique allows more light and air penetration which helps new growth and decreases powdery mildew. Thin out crowded new shoots, especially those under pencil width. This controls overall size and keeps the shrub full of flower-producing stems. Lilacs are also subject to buds freezing when an early spring warm spells is followed by the return of cold weather. It will flower best in full sun. Make sure to keep it watered through the hot, dry days of summer and into fall. If it dries out, the buds may wither. Putting compost under the plant annually will help maintain proper nutrients and healthy soil.